Assume "they" got rid of every semi-automatic weapon and every firearm that was owned by someone who isn't a government employee who is armed as a condition of his "job". (Impossible, but let's pretend.)
Even all cops are only armed with revolvers or pump-action shotguns.
Would that stop mass shootings?
Nope.
One cop who snapped could kill dozens of unarmed people with his revolver, because who could do anything about it? You think that wouldn't happen? How cute.
There is no way to completely end mass shootings. The best approach is to make certain any potential mass shooter faces armed resistance. And, again, anyone who can't be trusted with a gun can't be trusted around children.
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I'm in the last week before the surgery.