Why isnt it obvious to the masses that the "ban" will have this huge negative effect?
Because they don't research it. The fact is is that our position is supported by facts and numerous statistics as well as historical precedent. Their side is supported by emotions: it feels good to them; it's vindicating and it gives them closure on this event to feel as though they have taken action. It's a shortsighted and immature viewpoint, but as most people aren't very invested in guns, they don't care enough to get the facts before forming an opinion.