Even without looking at the religious (or sacreligious) aspects of the players, the mention of Tim McVeigh's actions compared to that of the school attackers is interesting. His actions have a lot in common with the Russian event this weekend.
If you wanted to 'get inside the heads' of the school attackers a study of McVeigh would probably not take you too far off course. Of course the reasons and the circumstances are different, but in the end McVeigh's thought process led him to select a similar target. That, in and of itself, is interesting food for thought. To me, anyway.