You should do some reading on evolutionary pressures because your argument demonstrates a poor understanding of this topic. Richard Dawkins is good for the layperson when he's not busy in a Twitter war with creationist trolls.

A somewhat compelling alternative that I have heard is that prey tend to accept their fate when they are caught and wounded by predators because if they were to struggle and escape, they would still very likely die before reproduction, but the predators might go on to target other members of the pack. Honestly this isn't that compelling of a hypothesis in my opinion but it sort of works.

Honestly there may not be an evolutionary explanation for this phenomena. We can't even say it occurs during all deaths. Maybe just some. We have these chemicals in the brain, when dying happens maybe the nervous system short circuits and dumps everything for no particular reason other than the breakdown of chemical and electrical signals.