I agree that the prevalence of mass shooters in America is both a cultural and societal failing, but trying to fix *those* would be extremely hard for the goverment to try to fix and almost certain to not fix the issue even assuming unlimited political will, so discussing it as an alternative to actual gun control does nothing besides deflecting away from actual working solutions.
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As for people using knives instead of guns if they can't use guns... sure?
Obviously any events like this are bad, but if the goal is to reduce the amount of harm and deaths (and it should be) then a mass stabbing is better than a mass shooting is better than a dude going to the store and buying (and then using) enough nerve toxins to kill an entire neighborhood.
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Plus, if you increase the difficulty and significantly reduce the number of kills and media attention these dudes are getting then mass casualty events in general will go down. The reason for this is that
at least half of the point of these shootings is causing fear and getting the attention of the nation, which is very much not something that will happen if you stab five dudes with a knife then get overpowered.
Some of those entries need cleaning up (seem to be <ref>s)
Bah, are you honestly telling me you don't recognize the existence of the
Ken Gelder subculture?