These two statements can be true at the same time:
1) I am horrified at the senseless slaughter of random people, and condemn it in the strongest terms possible.
2) I can understand how the shooter got to this state of homicidal rage when faced with governments and nations who do absolutely nothing in the face of Islamic terrorism and invasion except mouth empty platitudes.
In all honesty, I'm waiting for something like this to happen in America, either in places where they've imported Somalis (Minnesota and Maine) who refuse to assimilate, or after an illegal alien kills yet another American citizen, we find out they were deported X times over, lived in a sanctuary city, and a family member of the dead American decides they've had just about enough.
That doesn't justify it. That doesn't make it right. But you can see the situations forming. You can see the conditions coming together bit by bit, and at best our government doesn't care. At worst? Well, we already know the Democrats are trying to bring in as many illegal aliens as possible so that they can get new voters. Extrapolate from there.