He did not voice an opinion at the time. It would have been pointless, it would have changed nothing.
Because some of their leaders did not approve of secession.
Because of the Fugitive Slave Act, where official slave-catchers were appointed to return runaways to their owners.
Slave owners and some republicans. Abe Lincoln was a republican, republicans did not dislike him.
William Lloyd Garrison and his own personal experiences as a slave.
The Missouri Comp.
Who would want to work anywhere as a slave? In the Great House, slave women would be routinely raped by the masters, hated by the master's wives, unfairly punished by the master's wives, overworked in the kitchen, expected to care for the master's bratty children, and many more reasons to "dislike" working there.
North dislike The Fugitive Slave Law, because that did not support slavery, and therefore did not want to send escaped slaves back to the south. North brought the slavery issue to their own doorstep , and gave the runawys a heroic victim status.
Thomas Jefferson, the man who wrote the Declaration of Independence, although he was a slave holder, and the Declaration had many parts taken out in order to get the Continental Congress to approve it.
President Lincoln had long been in favor of the way that Britain abolished slavery. They made the transition easier by compensating slave owners for the loss of their slaves. Lincoln also wanted this to happen in the US. His first goal for this during the US Civil War were the slave border states. On July 14, 1862, he asked the Congress to approve the funds for any state that freed their slaves.
It protected the Southern slave owners' property rights. Often once a slave ran to a Northern state the slave would begin a new life in the north.... and Slave owners would find it very hard to go to the north and get their former slaves and bring them back home, even if they knew where they were. This new federal law stated that the local Northern laws must help assist the slave owner in capturing a known runaway.
It increased fears in the South of a slave uprising, and may have contributed to the Southern states' seceding from the Union. Second answer. The South did not fear a slave revolution. In fact during the US Civil War, there were no massive attempts to escape to the North and the possibility was there, without a doubt. Most Americans did not approve of violence on the slavery issue.
The quakers who predominated in the Pennslvania legislator did not like Slavery, a slave could cross the border from the slave states of Maryland, Virgina, and be considered emancipated. this was the reason for the DredD-Scott ruling that disallowed the 10th Amendment right of a state not to enforce servitude and demanded repatriation of slaves. That is why the underground railroad went through Pennsylvania because the Quakers did not approve of slavery.