Two choices.
1) Get the crazies off the street and remove them from the schools to prevent other mass shootings or lessens their number of frequencies. Every prevented mass shooting event is one less chance for the Dems and their press to politize.
2) Or take chances that another school mass shooting does not happen, but if it does, the Left mobilizes under Soros and the Dems against the 2nd Amendment in their further attempt to erode the Constitution.
Both have drawbacks.
Exactly, don't grab guns but crazies - as existing law allows for.