Yes, but I assume you actually clean your ass with soap when you shower? So, why then would be ok leaving your turd residue to get on your underwear all day?

To be clear, I do think bidets are superior to wiping your ass with bits of thin paper. That said, if a bit of toilet paper can't get rid of all the "turd residue" down there, then I don't think a bidet is going to be all that much more effective. I may be naïve, as bidets are exceedingly rare where I live, but I've never heard of one that uses soap and scrubs your bum as well. After all, don't people who use bidets still wash their ass with soap in the shower? I can only speak for myself, but at the end of the day my underwear is not covered in "turd residue." If a bidet is the only thing between you and shit-stained underwear, toilet paper might not be the issue. I assure you, as barbaric as we are in the bidet-less reaches of the world, most of us are not walking around with turd residue seeping from our underwear.

Your tp is not getting rid of all the feces in your butt and it's leaving a bunch of pieces of rolled up shit paper behind in your ass. I don't care how good of a wiper you are.

Yes a water pressurized bidet spraying your crack is quite a bit better... not as good as actual soap but still. You can apply this to any body part and ask yourself if you think wiping that part with some shaved off tree is better than water???