All this gun-related violence has nothing to do with illegals yet illegals get blamed for everything that's wrong with the US. The reality is that this is American on American violence. Be glad you're living in Canada, Mirza.
Having a gun in the house makes one feel safer? How so? Does one, upon hearing the door bell, open the door carrying a cocked gun? Also, even a background check doesn't guarantee anything.
Although not recent, it should give you a good idea of what's wrong with having a gun in the house:
http://nyagv.org/wp-content/uploads/2013/05/Accidental-Shootings-NYAGV.pdf