Google "more guns less crime" you'll get plenty.
Since Virginia loosened its gun ownership laws, they have seen, from 2006 to 2011, an increase of gun ownership by a staggering 73%. So what has happened since Virginia became the "Wild West," as liberals like to say? Not only has gun-related violent crimes not increased during the last six years, it's gone DOWN by 24%.
As for your question 享有用别人的生命换来的自由不可耻吗？ This is an ill-posed problem. My freedom is mine and granted by the greatest constitution in human history. My gun has nothing to do with some nuts killing people.
If you do not understand, ask yourself: Why are you driving a car knowing 30000 lives could be saved if freedom of driving is taken away. 享有用别人的生命换来的自由不可耻吗？ Now tell me how ridiculous is your question.