But this one is just pure cartoonish moustache-twirling evil.I think it's in line with mainstream conservative messaging. Their first resort is to argue against policy goals, but some "liberal" policy goals, such as keeping poisonous chemical out of rivers and streams, have broad popular appeal. To deal with that, conservatives rely on a broad anti-government message that they have been repeating and reinforcing for decades. No matter what the mission is, no matter how straightforward it seems, the government will find a way to cause more harm than good. That's how people can grow up next to a waterway, eat fish from it every week growing up, see it poisoned by dumping, reluctantly stop eating the fish, see animals die after drinking the water on a bad day, forbid their children from playing near it, and still thank God for their Republican congressmen gutting environmental regulations. The stream should have been kept clean, the dumping should have been prevented, but environmental protections would have made things worse, because it's just common sense that government makes everything worse. Everybody knows that.
Another message conservatives have been drilling for decades is that liberals are only interested in helping degenerate, parasitic subsets of society. Conservative voters on the lower end of the economic spectrum don't trust law enforcement much more than liberals do. They can easily imagine themselves being railroaded by corrupt or incompetent law enforcement using bogus forensic data. However, they don't imagine that liberals, or a program set up by liberals, would help someone like them. Conservative messaging has drilled it into their heads that liberals are only interested in helping lazy, dishonest, dissolute, parasitic people, and that's not how they see themselves. So they see government programs as indifferent to people like them, which adds an extra layer of distrust on top of the perception that the government gets everything wrong anyway.
Trump is not a conservative, but he understands the voters that conservatives have created.