Remember, they don't own any guns. That's why your (impeccable) logic and the apparent contradiction carries no water with them.

They want scary guns gone from the boogiemen the news told them about (White Nazi Supremacist Confederate Evangelicals), and they don't realize that the centralized state power they also demand (and all the fun government programs and gibs and massive taxes that come with it) is a exclusively a function of monopolized violence requiring those same scary guns as a matter of course. They don't realize because they are stupid.