You must not know crooks will hurt or kill you to get what there after. Plenty of gun stores have been robbed. Plenty of homes have been burgled. This is where most of the stolen guns come from.
there are folks making pretty good $ buying guns (mostly used, no background check) legally, and later selling them to folks that can't legally own them. i know an ex-cop that was doing that for folks with a sob story about how mean & unfair they thought it was that their legal problems kept them from owning guns. he's not the sharpest chisel in the toolbox...