Hey man, thanks for the reply.
First and foremost, i'll definitely give Umineko a shot. Second of all, i can sort of understand what you mean. Jack, a man who feels deep guilt for murdering 2 innocents, just stabbed 2 more people. As a way to sort of pay for his crimes, he decides to commit suicide instead of living with the burden of the crushing guilt that he must've felt at that point.
It's for sure an interesting wrap-up, and despite how i said i felt no satisfaction with 3 out of 4 of the endings, i feel like you went about it in a very smart way.
Have a good one!
ps, the ending was cheesy as hell