Access to guns isn't the only problem here. We really need to address why so many right wing white men commit acts of terrorism, but no one wants to address that so the conversation just begins and ends with gun control. Frankly, I do not think any gun control measure that could actually be passed in the US would stop these people from doing this. The ideology behind these attacks is what we need to fight.
There are one or two exceptions, but virtually all of these people are right wing white men, virtually all of these people have a history of misogyny and domestic violence. These men are just extreme examples of political and social views that are very common in our society. There is a reason why so many people do this here, and why so many people defend them, why they tend to be a certain kind of person, why law enforcement is so absurdly lax with them. These are the problems we need to act on.
Caste your vote for the good of your country, not some traitor.
Edited for spelling, grammar, punctuation, composition and general cohesive train of thought.