For argument’s sake, let’s suppose terrorism is as common as lightening strikes.
Lightening strikes the earth millions of times every day, and if you are unfortunate enough for it to hit you, you will probably die. But it is random and cannot be controlled which is why sane people with common sense don’t run around outside during a thunder / lightening storm.
Terrorism is not random and can be controlled. Furthermore, we know the source of it (Islam) and have it within our power to keep Islam penned up in the countries that spawn, support and contribute to it. Why import it here? Why take the chance? Why run around outside during a thunderstorm?
You are exactly right but lets take this one step further. One does not do things to invite a lightning strike on your position. The Communist Left actively invites the murderous scum to strike.