Many statements in the OP are clearly based on ignorance, I'll just drop to the end.
So hats off to Witnesses because they mean goodness not harm.
The Bible says that the blood of dead animals should be poured out and not eaten. No clear punishment was expressed for violations. Offenders who were clearly stated as eating blood were not put to death. In the NT, the command to abstain from blood was placed alongside abstain from things sacrificed to idols--something Paul explained was a conscience (don't ask, don't tell) matter. The closest to any consequence of eating blood in the OT was that one should wash and be ceremonially unclean until the evening.
HOWEVER
Jehovah's Witnesses teach that one must die rather than accept medically transfused blood from a living donor. Many JWs, including minor children and new mothers, have died needlessly because they followed this misguided and unscriptural teaching of WT Corporation.
So if someone is impressed by how well-dressed JWs are and how well-behaved their children are, know that there is a deadly price that goes along with the WT belief system. I'm horrified to look back at the years that I was a JW and carried the "Death Card" in my wallet because I believed the lies of WT.
That is not "good". It is extremely "harmful".