Caz72 wrote:
Why are there such dirty men out there wanting to rape vulnerable people ?

Power and control. It greatly arouses these sorts of people to be as this perverse. He saw the bus was empty and thought he could take his chances exploiting you.
You'd think as progressive as society says we are, this sort of behaviour wouldn't still thrive, especially as somewhere as public as a bus!
Hopefully, there's CCTV, so it should be easy for police to find him or at least make a start.
As traumatic as this was for you, the positive to take from this, was being able to stand up to him and the fact he ran as soon as you threatened to call the police goes to show him not everyone will submit to his disgusting proclivities.
As long as you're ok as you can possibly be. Fingers crossed he's caught.
_________________
"I may not have gone where I intended to go, but I think I have ended up where I intended to be."
"And I've embraced the calamity, with a detachment and a passive disinterest."
"I hear voices...But I ignore them and just carry on killing."