There’s a concept in politics called the gish-gallop. Also called firehose of lies. It’s a time honored tradition, but in the past it was usually multiple people spewing crazy shit until they got called out too hard, at which point they’d quiet down and someone else would rotate in to take the heat.

With the way congressional districts are drawn, and now that they’ve seen Trump successfully accomplish this as a single person, to me the simplest explanation becomes that these liars lie because they know there won’t be any immediate consequences, and that the more they can squeeze out, the less likely any given piece of it will be addressed.