@Le_Bob, it could be said to be according to the keikaku of the tower, since it seems that the tower observes people and maybe just want sth interesting to watch.
It takes some serious determination that borders on mania to do what he did...
That said, he is ultimately doing it for the greater good.
The manga hasn't described just how much of a scumbag he really is.
The world really is better off without him.
The next few chapters should elaborate on it tho...