Because healthcare promotes health and life, and guns are instruments created for the sole purpose of death. You might as well say "Next they'll mandate we all jump off a cliff and fly a rocketship into the sun!" Come up with a better analogy, you're on the right track, just way way off.
Sole purpose of death. You are incredible.
If I see a guy carrying a gun or a knife, or a ball bat, I would avoid trying to rob the guy, because he could defend his "stuff" or person with his gun, knife, or ball bat, etc.
Purpose could be a deterrant but only a liberal sees things like "sole purpose"