I'm not, I want to welcome ISIS into the US. But before we would do it, step 1 of the plan would be to promote concealed carry permits among the population.
If something like 30% of the population had concealed carried pistols, I think it solves most all terrorism problems instantly. Sure, they can make bombs, but they can do that anyway... and you get the 1 bang and it's done or whatever.
Then when you bring in the Asylum Seekers from Syria, you just have the TSA search them.
And yes, they might try doing a few dumb things, but they wont be able to hold schools hostage if we permit concealed carried arms into schools. In the 1800's students in the USA could bring their firearms to school. In one instance, someone had come to kill a teacher, but the student body stopped the murder by getting their firearms out and preventing the person from doing their teacher harm.
Now, concealed carry society requires less idiocy. And that's achieved because the bozo who wants to flash their pistol at people randomly, can be shot and killed by the rules of self-defense. If they point a gun at you, and are not police, you can kill them. So after 5 years of this, the bozos are no longer around. That's the transition phase.
Just imagine, less school violence, because you don't bully people who pack, and even verbal harassment is limited. Would be great. And "what if someone tries a school shooting!?" ... deaths are minimized because the student body is already armed and trained in defending themselves with their weapons. Deaths could certainly happen, but they're just generally capped at an upper limit of a few people because society is armed and achieves counter-force.
And if we did this, I think ISIS coming to the US would be fine. We would just breed the terrorism out of them, and they couldn't do anything major.