So I just discovered that I have been working next to the waste of oxygen that raped my best friend several years ago. I work in a manufacturing environment and I know that you can’t fire someone just for being a sex offender unless it directly interferes with work duties (in the US). But despite it being a primarily male workforce he does work with several women who have no idea what he is. He literally followed a woman home, broke into her house, and raped her. Him working here puts every female employee at risk. How is that not an unsafe working environment? How is it at even legal to employ him anywhere where he will have contact with women?
Where I work, most positions do not require a background check so we have a mix of people (men, women, trans, nonbinary) with criminal convictions, including sex offenders.
The only thing that matters is their behavior in the workplace. You get fired because of attendance or poor performance.
The biggest problem people at my workplace are the people who try to make someones past an issue.
Also, your statement that you “highly doubt that changed him” is very telling. Basically it shows that you are the one with the problem. Unless you have firsthand knowledge then you are trying to justify your negative feelings.
Maybe this last time changed them. Maybe they got help. Maybe they’re in therapy and are trying to change.
This person and your employer are under no obligation to do what you want when there is no justification other than your own personal judgement.