Is English not your first language?
I speak many languages yet your conclusions about Lev 17 are not proven in your argument on this thread. Your assertions are not substatiated.
how vs why
One distinction about the blood from an animal found dead is that it could not be poured out. Another distinction is that if an Israelite ate a dead unbled carcass he became ceremonially unclean by doing so.
But all of the law needs to be considered not just the verses that you like with your explanations about them.