Even if he was suicidal, it’s hard to see why he would want to take 150 people with him, unless he was either a terrorist or had severe mental problems. And it’s hard to see how someone who had severe mental problems—not just small ones he could keep hidden—would be allowed to become a pilot.
The fact that they won’t tell us his religion tells us a lot.
It seems many suicidal people these days are so filled with hate that they want to take others with them.