What do you think of the idea of putting your used toilet paper in the trash can instead of flushing it down the toilet?

I’m a member of an RV camping site and there are a handful of people who are utterly convinced that flushing toilet paper down their RV tanks will cause all kinds of problems. They put their used toilet paper in the trash instead. Some of them even do that at home! I just can’t even wrap my brain around that, it’s so gross.
I posted an experiment I did with regular toilet paper v special RV toilet paper to prove that the RV toilet paper disintegrates very, very quickly. I would post a picture of my experiment but Photobucket is giving me fits.