President Trump on Thursday enthusiastically embraced a National Rifle Association position to arm highly trained teachers to fortify schools against mass shootings like the one last week. Mr. Trump, who said the armed teachers should receive extra pay as an incentive, promoted his idea as demands for stronger gun control intensified across the country.

“You give them a little bit of a bonus, so practically for free, you have now made the school into a hardened target,” Mr. Trump said. The president estimated that 10 percent to 40 percent of school employees would be qualified to handle a weapon — he offered no data for the claim — and said he would devote federal money to training them.

Yes, Devil, we understand what you want, but the Devil wants us to do what is wrong, not is what is right.