It was taunting them. However, in a good way the taunting brings things to a head. It brings the violent out into the open faster for law enforcement to deal with them.
Also, Mr. Trump seems to have learned more about Islam this past year. Perhaps he will voice the reality that Islam is a domination ideology seeking to bring into submission all nations and cultures. Per Islam, this attack in Brussels is defensive because Westerners in general and Brussels in particular are offensively attacking Allah and Islam by not submitting to Islam.
He didn’t learn before he was 70? Sorry, to me it’s evident he is saying stuff just to get attention. Trusting someone who has proven grossly untrustworthy is very foolish.