The quick answer is that communism is the greatest evil ever introduced on the planet.
Read and understand it’s true history and destruction.
It always starts out sounding great and called Socialism.
The most recent is Venezuela with people starving and leaving in droves.
Another was the USSR. (Socialist is in their name)
One that didn’t make it to total communism was Nazi Germany. Nazi stood for National Socialist. They were major leftist.

The modern dems more closely resemble them with their attempts to disarm the citizens,
Intimidation tactics with Antifa (brown shirts), and attempts to nationalize industry.

My opinion about what "states rights" is:

I'm just saying that is similar to what we have now. A lot of us don't want CA and NY liberals trying to impose their will and to dictate what the rest of the conservative country wants. Those two states think they have states rights to tell the rest of us what we should do and the rest of us say that our states have the right to say No and to determine to remain conservative and not kill innocent babies. Only, now the war is fought in Congress and not on the battlefield (yet?)