How is making words that you don't like illegal a bad thing?
If you took the time to understand the second amendment, why it was written, and modern firearms you might reconsider your question.
1. AR-15s or whatever are not military weapons, they look like, but do not function in the same manner. When looks matter more than function, you've got a problem.
2. When the second amendment was written, the civilian population was on a whole better armed than the military (outside cannons). Today, that is not true.
3. The Founders of our nation didn't trust the government to abide with the restrictions of the Constitution and bill of rights as the government is made up of men not angels. So they inserted the second amendment so that the government could not disarm the people.
4. There are already volumes of laws that prohibit certain types of weapons, their use and more. If these laws haven't eliminated violence and crime, what makes you think that more laws will have a positive impact?
5. And lastly, when did taking something from law abiding people ever prevent the bad or evil people from doing what they are intent upon doing?
Almost every argument used to advocate for gun control (banning etc.) could be used by those who want to ban hate, unpopular, or just speech they don't like. If the Constitution can be circumvented with laws, it isn't much of a document.