From the article:
The heck? 'Often at kindergartens'?

we are not talking about type of weapon used, but the target.

PRC got way too many attacks targeted at kindergarten, Murica attacks happened in school/universities/malls but rarely kindergarten.

Most Murica school shooting happened when the assailant is the student/staff of the said school, but prc kindergarten attack mostly from unrelated coward assailants that choose kindergarten because children are easy target that cannot retaliate.

You failed to see that most Murica shooting, they are student/teacher/staff of the school. They are revenging against the establishment/classmate/teacher/colleagues which they deemed have wronged them.

The prc attackers who target kindergarten, most are unrelated coward, their gripe is not towards the kindergarten, but towards the society/unjust system.