Because liberals hate freedom. No, seriously.
I believe an individual's freedom to own firearms, and to trade them freely with other people, outweighs any safety that may be gained by restricting them--which isn't much anyway, because the black market is a think.
I also believe in an individual's freedom to keep what they earn. Some liberals want to tax the rich by up to 80% of their fucking income, I think that is wrong. We should all pay the same, low, flat rate of tax. Liberals want too many government services, funded by tax money taken from the earnings of people. If you have the skills to make yourself rich, you deserve to enjoy it, not be robbed by the government.
I also hate conservatives, though, because I also think an individual's freedom to put chemicals into their own body, or to have an abortion, is important. No one deserves to go to prison for years when they did not harm anyone or anyone's property. There are too many people in our prisons.
I'm libertarian, and you should be too.