This guy’s wife and kid got nothing.
That makes his a selfish, murdering coward who left his family to deal with his misery and caused another family to suffer the loss of a loved one.
Deliberately flying a plane into a building and causing your own death and the deaths of others, is many negative, wrong things, not the least of which is crazy. But, cowardly it isn’t, not under any meaning of the word with which I’m familiar.