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Yeah. Well, No.

A physician who harms his patients through negligence or malice gets struck-off.

A lawyer who steals his clients' money gets disbarred.

A banker who mismanages his clients' funds loses his banking licence.

If any of those was found guilty of using information from their clients to blackmail them, they'd have no future in their chosen trade - ever.

Sure, but presumably they weren't working as a security engineer at the time.

Or think of it this way...

Could someone not be a doctor if they had assaulted someone before medical school?

Would a lawyer not be able to be admitted to the bar if they had been convicted previously?

I'm actually not sure about those, they both might not be allowed. I just lean on the side of forgiveness once you've "paid your debt to society".