As someone who's worked as a journalist, part of my education in that was the "they would say that wouldn't they ?" test.
Imagine you run a small business (say) fixing computers.
A big TV channel turns up and says they are making a program about Wall Street computers.
Do you say :
a) "we're a shit little firm banks won't use us"
b) "lots of banks depend upon us"
Same with hookers.
BigBadWolf is right, what people do with the money you pay them is their business provided it's legal and they leave it at home.
Part of my work is dealing with situations, where people have acted in ways that are not ideal, and if you know as much stuff as I do, you'd realise that you couldn't staff any large firm if you started applying the pseudo-ethical standards that the media apply so that they can call it a "scandal". Again from my own experience in the media I will share that they are worse than any bank.
I don't just mean banks couldn't, I mean your supermarket wouldn't be able to fill its shelves and the lights in you home would go out.
Have you shouted at someone whilst angry and/or drunk ?
That's a criminal offence dear. Yes it is, people get convicted of it; you were lucky, one day you may not be.
Want to be fired for it ?
Of course that's a matter of degree and your defence when hauled up in front of senior management and HR would be "this is nothing to do with my job", wouldn't it ?
Something like 1/3 of the population have cheated on their wife/husband, and audits of tax returns don't imply that honesty is a universal virtue.
As it happens, my political philosophy is what my (Oxford PPEist) wife labels as "classical liberal", and part of that is to apply rational tests to power.
The OP seems to feel that he has the right to judge whether people who fail his test should be allowed to have careers in banking.
The test here if you are to adopt that rule is to work out what would happen if someone who he regarded as a bad person got that power. That's necessary because power may first be given to someone you like, but inevitably the "other side" will get it, and sooner than you'd like.
The "bad people" now can fire you if you go to a place where prostitutes are known to work, or if you're seen talking to one.
"You didn't know she was a hooker ?", sorry we don't believe you, collect your stuff from security on the way out.