Why do some think to finish russia with nukes with preemptive strike

That's stupid! The russian people aren't bad, it's the regime in power! And, russians have nuclear submarines as well that can launch nuclear missiles in retaliation. Millions, if not tens of millions of Americans would die, infrastructure ruined , famine, long term radiation poisoning, etc. And China just waiting to step in and take over whatever usable land and assets were left!