Some of those people are not lazy, irresponsible or stupid, just inexperienced.
They type in "book publishers" and up come links to the Big Six. Those sites keep the "submission guidelines" links in the fine print, so most miss them. If they can find them, they discover they have to have an agent. They've heard agents can be dishonest and that the best of them take money for doing nothing, so let's keep moving.
What's up next will be the vanity houses--yikes, they want money to publish!
And then there's PA with its flag waving promise that they will pay writers. Words like "traditional" and "old fashioned" are carefully calculated to reassure them and hey, look at ALL the Christian books in their store! All their books are available to stores and they're not a POD, whatever that is.
The target market misses the red flags, falls for the sales pitch and bookmarks the page. No need to google them, just hit the bookmark link.
A few might do a search about the company--often after they've signed the contract.
So, no, not all of them are stupid, they just don't know any better. When you think you have to pay to publish then PA starts looking like a godsend. And everyone knows that once you get a book into print that you'll get instantly rich.
Yup, PA wants them to think that. In the meantime Willie is probably still shopping for yachts, Miranda has a racehorse to feed and board and I suppose Larry is busy stuffing a mattress with cash he'd rather the IRS never finds.