I do not play City of Heroes, however if you read his research paper and his comments, he did those things to remove those players as obstacles in order to complete the objective of the zone (capturing 6 towers as I understand).
Since I do not play please let me know if I misunderstand, but it sounds like he was taking a perfectly legitimate avenue to his ultimate goal of capturing those 6 towers and winning the zone.
The towers are, by design, nowhere close to any of the key positions. No one close enough to be teleported into the towers (the power has a range limit) is in any way threatening the nominal goals of the zone.
I'm not sure why they didn't ban him, honestly. I had gathered that this type of sociopathy was considered griefing by the developers and grounds for temporary or permanent bans.
Since I do not play please let me know if I misunderstand, but it sounds like he was taking a perfectly legitimate avenue to his ultimate goal of capturing those 6 towers and winning the zone.