@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...
Kinda....
Since subaru's returning by death ability has specified spawn points, so he wouldn't be able to do the same as gong-ja.
And also Subaru is told a lot of different times that he shouldn't abuse return by death, since its unknown what happens to the world that he leaves behind when he dies, not considering how much more painful his deaths are
I was thinking: "is the ability a flat 24 hours or return to predetermined time of the day? If the former, then he could theoretically go back to the past by dying fast enough.", and he did just that in this chapter.