if you have to wipe with toilet paper anyway, doesn’t that defeat the purpose of having a bidet?
The purpose of a bidet isn't necessarily to make toilet paper unnecessary, it's to clean properly. Before getting a bidet I would just step into the shower and use the removable shower head to wash my ass with a little soap and warm water, towel off after, bam super clean. I still do that, but now the bidet can save a step if I'm in a hurry.
Basically, try this experiment. (Quoted from some comedian) Smear some poop on the back of your hand. Then wipe it with dry paper and nothing else. Do you feel clean? Ready to go through the day? Of course not! You want to actually wash that off, and that's the pleasant feeling from using a stream of water to feel thoroughly clean, not just removing residue but getting up in there into the outer wrinkles of the butthole, reduces the chance of getting the itchies later.
(This is particularly of consequence if there is ANY chance whatsoever of ending up naked with another person. You might not notice it, but other people would get hit with a musk the moment your underwear drops, and not the nice kind.)
Systemically, yes this is why the police are allowed broadly by society to discourage helping those in need.
On a more personal, fundamental and visceral level, it's because the police are a product of people who have held power for a long, long time. And you know what poor and homeless people are to the systems that maintain the status quo? They're an inconvenient reminder that our system is designed to benefit a few, and that there are people hoarding gold and diamond backscratchers for every day of the week while children starve on the street.
That's a pretty downer reminder, isn't it? Throw in some of our human vices that we all share from top to bottom like substance abuse and you have a complete picture of what any of us could become if we're not careful.
See, for the vast majority of comfortable Americans, the homeless they pass every day are not reminders that humans need help, they are a reminder of failure. In a world where success is measured in dollar signs and possessions, someone without either is a scary, harsh reminder that we're all on a tightrope.
Brush them aside. Put them somewhere. Get them into some kind of "camp" and shuffle them out of view, lest they spoil this perfect image we have created of the modern world.