The incidences of terrorism have also been dropping worldwide...except as perpetrated by extremists from one religion: Islam.

Condemnation of the murders in Montreal is universal. There are already laws in place against murder. It is a tragedy that innocent people were killed because of their religion. Yet when radical Muslims commit such murders daily, it hardly even makes the news anymore unless it's particularly egregious. 

https://www.thereligionofpeace.com/pages/site/the-list.aspx

You really need to live somewhere in a Muslim country before being quite so glib about allowing large numbers of adherents of a totally incompatible belief system to enter your country. The fact that the vast majority are peaceful does not diminish what the few do.