A) 99.9% of urinals don't have toilet paper available... because they're not toilets
B) Any man will tell you getting toilet paper stuck on his member is an absolute pain... in terms of annoyance... and it can be quite painful... can take a while to remove properly... mixed with the fact if you;re using a public toilet you're most likely in a rush
C) Most of us guys do wash our hands... women however.... have you ever seen the sight of a womens toilet? I mean it's fairly common to see where drunk or thoughtless blokes have missed the target, occasionally you will see stools in the bowel.... once I saw a stool on the seat..... Womens however..... to this day the sights I have seen multiple times in there is just horrific....