Obviously some people don't like the conclusion. If you are solidly in the gun-control-is-good camp, the weak evidence in this opinion piece isn't going to sway

Obviously some people don't like the conclusion. If you are solidly in the gun-control-is-good camp, the weak evidence in this opinion piece isn't going to sway you. The natural effect is to cause such humans to dig into their entrenched positions even further. That requires considering this article and author to be stupid or hostile and hence flag-worthy.