How is trump still a viable candidate for president? Really, how?

Moving this from “Is Trump Confused” thread, as suggested by moderation, to discuss the idea that Trump is the product of both major U.S. parties:

As a centrist, I would like to agree if I could. But so long as ours remains a free country, there is no way to prevent far-left people from making statements, just as is true for far-right statements. And defund the police did not come from the Democratic Party, besides that it predated the 2016 Trump nomination. Joe Biden says that most police are good.

I found the following article supporting your POV, and I will link to it even though I cannot fully buy it:

How the Left Created Trump

What about — how the right created AOC? Only thing is, the Democrats are not about to nominate her for the presidency.