Mass shootings are a drop in the bucket in terms of gun deaths, vast majority are either suicides or inner city gang violence. Majority of homicides are committed with handguns rather than assault rifles. If you account for demographics the US has lower gun violence than many European countries.

Personally I think it's funny how the left and right are so illogical on their chosen issues. When the right doesn't want to take refugees they stoke fears about Islamic terrorism. When the left wants gun control they stoke fear about mass shootings, despite the relative rarity of both.

Both sides of the aisle prefer emotional manipulation to actual facts when it suites them.