I don't think that's an issue, really. As Jerry Seinfeld pointed out, soap is pretty much self-cleaning, you know, being soap. Even if it's not anti-microbial or anti-bacterial, the soap prevents microbes that aren't you from adhering to you. I doubt anyone using the soap after him was in any jeopardy.
But could you re-route your rage toward the (multiple expletives deleted) who pee on the toilet seats and floor or don't flush? I don't understand the guys who have to hide in a stall to leave a whiz in the first place, but when they don't lift the lid, watch where their flow goes, and don't flush, that really pi$$3$ me off. I think the penalty for assault should be limited to a $1 fine if it was preceded by the assault victim having exposed others to his body fluids in this manner.
So you don't want to touch the dirty toilet even to lift the seat or flush it? That's what we have SOAP AND WATER FOR, NIMROD!!!!
I once worked with a guy who apparently had some sort of phobia about that, and he would pee all over the toilet rather than touch it. People put two and two together and figured out that it was always this way after he had just been in the men's room, and he left abruptly a short time later, so maybe he got canned, no pun intended.