> if you believe your organs don’t die when you die, then don’t donate your organs?

Because "I" don't know what "I" am.

Am I a brain? Am I a soul? Am I the universe?

I have no idea. Science currently has no idea. Religion is unprovable.

I want to donate my organs. If my death can bring life to others, it would be a truly amazing deed I could do.

On the other hand, if I am just a brain, I do not want to be locked into some sort of drugged, half-conscious state where I can't scream.