Why do Democrats think banning guns will reduce mass shootings/bombings?

Criminals can still get guns illegally. Banning drugs never stopped the criminals from buying/selling drugs, now did it? Nope.

As I just wrote on Quora, the Unibomber did his killings with homemade bombs and the guys who bombed the Oklahoma City Federal Building did it with a few gallons of Diesel fuel and some bags of 13/13/13 fertilizer. You can probably get it to mix exactly correctly within one or two tries, which is why so few people noticed them making and testing practice bombs. I know exactly how to make both types of bombs my own self, and you can do it with some basic household chemicals or some stuff you buy from the local farmer's co-op.

Why do Democrats think banning guns will reduce mass shootings/bombings?
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