I don't know about others, but for me, too many progressive politicians seem to be outright racists. Going along with this are things like the elimination of religious freedom and religious tolerance towards Christians. Many aspects such as racial quotas and reparations for slavery strike me as terrible invasions of personal freedoms and violations of our Constitutionally protected guarantees against persecution. The very idea of "protected classes" of people within our society is anathema to a color-blind society. Our society has a poor track record ion that area....but it is what we should all aspire too, and much of the progressive movement seems intent on righting discrimination with more discrimination, this time against the "oppressive white male patriarchy" (which I believe is BS).
The single payer thing is a bogey man that is used to scare us conservatives. At its extreme it takes away all our individual choices. ObamaCare caused me to lose my plan, and some of my doctors. It cost me a ton of money, as my wife was suddenly covered for pregnancy even at her advanced age.
You said something earlier that I completely agree with. In my life, I don't know anyone who is as extreme as the politicians are. Yet, if these politicians get elected, they will go ahead and do some of this stupid stuff.