I'm not certain which nation you are asking about, but some reasons were common among men from all nations. Some men believed the idea of war itself was evil, a great wrong, simply ludicrous, and wanted no part of it. Some men were very religious, and believed killing others was wrong, and that dressing up the killing as patriotism or nationalism made no difference. Some men were selfish and just wanted to stay home, because they had a good job, or a best girl they did not want to be separated from, or they just did not care about any of the issues the war was alleged to be about. Some men were physical cowards, and did not want to get hurt or killed. Some men in the US and the UK believed that if they were free citizens, as they were often told they were, then forcing them into the military at gunpoint or on the threat of imprisonment, and making them go risk their lives and participate in killing others against whom they personally had no grievance, made them not actually free at all, but pawns, possessions of their own government, to be expended as that government's whim might find most convenient.
There was a great movement to organize the working class and laborers in that era, which had been gathering strength for fifty years. The trade unionists, anarchists, socialists, communists, all believed that the common soldiers, the men in the ranks of all nations, had more in common with one another than they did with their national leaders. They thought the war amounted to the power elite of each nation forcing the workers and the poor of their nation to go and fight the workers and the poor of other nations, while the rich got richer selling guns, food and munitions to their governments, and that the politicians were quick to send off the boys and young men to get mangled and killed, while not a hair of their old gray heads would get mussed in the war their very own pig-headedness had brought about.
The Conscription Act of 1917
27 January 1916: the Military Service Act.
During World War I, Canada introduced conscription in 1917 through the Military Service Act, which mandated military service for men aged 20 to 45. Approximately 400,000 men were conscripted, but only about 100,000 actually served overseas, as many sought exemptions or were unable to fulfill their service obligations. The introduction of conscription was controversial and led to significant political and social unrest in Canada.
Germany
The Conscription Crisis of 1917 in Canada arose during World War I when the government introduced mandatory military service to address dwindling volunteer numbers. This decision sparked intense political and social conflict, particularly between English-speaking Canadians, who largely supported conscription, and French-speaking Canadians, who opposed it due to a sense of alienation and differing national loyalties. The crisis deepened divisions within Canadian society and had lasting effects on national unity, ultimately influencing political dynamics and responses to future military conflicts.
There are many cons, for one, trying to pass conscription laws was very hard and caused stress for Canada's leaders at the time.
Billy Hughes was in favor of conscription and Archbishop Daniel Mannix was against it. In 1916 a referendum was held and the answer was a "NO", in 1917 another referendum was held still resulting in a "NO".
Many French Canadians also opposed conscription in 1917.
They were conscripting Canadian soldiers to join war ecause they did not have enough.
J.-E Caron has written: 'Conscription and agriculture' -- subject(s): World War, 1914-1918, Conscription Crisis, 1917, Agriculture, Food supply
Propaganda was used in Australia during World War I to sway public opinion towards conscription. It involved exaggerating the threat to Australia, questioning the loyalty of those who opposed conscription, and portraying conscription as necessary for the survival of the nation. This propaganda campaign divided the country, leading to two referendums on conscription in 1916 and 1917, both of which were defeated.
The Conscription Act of 1917
By this stage, all those those willing to volunteer had already joined up, yet as casualties mounted more troops were needed, and so conscription was needed to fill the depleted ranks.
Sister Against Sister - 1917 was released on: USA: 4 March 1917
It divided Australia as in it resulted that there were bitter debates and conflict within society at the time and within the labour government itself. The Australian socity divided into pro conscription and anti conscription. It brought to surface underlying conflicts.
There was no conscription that could force a man to serve overseas. and Australians voted no on this in 1916 and again in 1917. However military training for Australian men aged 18 to 60 had been compulsory since 1911.
In 1916 the Military Service Act was introduced - this was soon nicknamed the "Batchelor's Bill" as to start with conscription only included unmarried men between 18 and 41. But it was widened in May 1916 to include married men as well. By April 1918, it had been expanded to include men up to 51.