the dodgy ones
Nations may want to retain or develop these weapons for various reasons, including deterrence against potential adversaries, maintaining a position of power and influence on the global stage, or as a means of defense in case of an attack by other countries. Having a nuclear, biological, or chemical arsenal can also act as a bargaining chip in international negotiations or provide a sense of security against perceived threats.
Nations may want to retain or develop an arsenal of nuclear, biological, and chemical weapons for deterrent purposes to dissuade potential adversaries from attacking. Additionally, they may see these weapons as a means to protect their national interests and security in a world where other countries possess such weapons. Lastly, some countries may view these weapons as a way to maintain a position of strength and influence in global politics.
Nations may want to retain or develop these weapons for deterrence against potential threats from other countries, to maintain leverage in international relations, and to establish themselves as powerful players on the global stage. However, the use of these weapons is highly controversial and comes with significant ethical, humanitarian, and environmental risks.
Inspectors in Iraq found evidence of chemical weapons, biological weapons, and ballistic missiles in violation of United Nations resolutions. They also uncovered facilities and programs designed to develop weapons of mass destruction.
Developed nations
No, both are legal weapons for nations to use in war. Only chemical and biological weapons are prohibited by international law (although that has not stopped certain countries from using them).
Reducing trade barriers
Yes, of course!
Any answer to this question would be pure opinion, but I sincerely believe that nations should not have the freedom to develop nuclear weapons. The more nations that have them, the more likely it becomes that they will be used.
The advantage is that chemical weapons doesn't destroy buidings. Also these weapons can be used by poor nations without nuclear weapons.The disadvantage is that chemical weapons contribute to the pollution of air, waters and soils. Also the use is sometimes dependent on the atmospheric conditions.
to allow industrialized countries to dominate developing nations
There is no one standard for all nations. In the US (and most NATO nations) chemical grenades are gray in color. Markings may be dark red, violet, or green, depending on the filler chemical.