You think the left is open to debate? Then read this. A fascinating story: Coming Out As A Republican To My Democrat Family Went Worse Than Coming Out Gay. Lots to read and you should read it all, but let me select this to give you some idea of what you will find.
When, in my adulthood, the liberal policy agenda became problematic for me, I found myself at a loss. I began to raise questions with my family and friends, and met resistance. It was not because my concerns were particularly inappropriate; I was just not supposed to be questioning at all.
One could disagree with nuances, but not the judgment of the (then) president, or the party. Period. The irony of this apparent intolerance for diversity of thought by the party claiming to champion the rights of groups underserved by the status quo was not lost on me.
For the first time in my progressive life, standing up for the values that I most strongly espouse—truth, morality, self-reliance, boundaries, tolerance, and a healthy dose of Jewish skepticism—was damaging my reputation and character. When I publicly opposed my dad’s support of the Iran deal, I was admonished. I had few friends with whom I could have a civil political conversation: one stopped all communication with me for two weeks because Trump won the presidency.
The left expects everyone to behave like a dumb terminal, with the views of the main processor the only views permitted. But it is possible to escape so we must keep attacking their views before we find ourselves overrun and submerged.