Well fortunately we’re going to have the opportunity to find out what he really was thinking, this time. Until that’s released to the public, you don’t know any more about it than the people you’re shouting down. Since he chose such a specific method, and not on his own plane which would have been easier, there’s reason to suspect it was a targeted attack on others. Being willing to die in the attempt is a step away from being suicidal. Would that all attempts at mass carnage were resolved with all lives saved, like this one.