I mean you are making a fair argument that there’s a distinction between your own morals and the binding rules in place. You are free to feel a lot of things that are very bad, but when you act on them you will bump into reality.
That said I think the original comment was meant to say that the only reason he is here is because society through the legal process has found him to be safe to work there.
Now to get beyond the feelings against him OP can obviously talk to HR and make sure they get some distance, but if the courts found him not guilty, he deserves to be there. Imagine serving years in prison, working on yourself until the government finally finds you fit enough to enter society again, only for ppl to kick you out of your job again because of something you tried so hard to leave behind. That’s why the prison system usually focuses on rehabilitation instead of punishment in most civil countries.
What I’m saying is, the court’s ruling does not have to change the way you feel, but the court also says you have no right to take his job from him unless he commits crimes again. No feeling can measure heavy enough to weigh up against the right for him to live a normal life.