The meta discussion was triggered by my controversial custom close reason, and it appears that my point has been misunderstood, so let me clarify. This is the custom close reason:
I'm voting to close this question as off-topic because the question has been substantially edited to invalidate several existing answers, and so it should be deleted altogether.
I like enderland's edit, and if that was the original question to start with, I would have no problems with it. However, the edit removes a key ingredient of the original question. The OP was clearly looking for ways to get the coworker fired for a crime that happened at least 20 years ago, and for which he has already served the punishment laid down by his country's laws.
This is a clear example of an XY problem. While providing the OP ideas on how to avoid working with this coworker can certainly appear to resolve the current problem, it doesn't strike at the root of the problem, which is the OP's belief that the coworker should be given additional punishment over and above that given by the law.
Most of the answers seem to provide him options to avoid working with the "tainted" coworker, thus implicitly acknowledging that it is reasonable and appropriate to shun an ex-criminal in this manner. Only Richard's answer seems to strike at the root of the issue, and his answer doesn't sound particularly rude, although it may be blunt.
While the edit reduces the opinionbait, and is much more generic and answerable, it is not what the OP was looking for, and brushing his actual issue under the rug to make the question less controversial doesn't help him either.
As a result of the edit, the existing answer(s?) which addressed the actual issue suddenly sound needlessly critical of the OP and some parts of it, such as calling out the OP on his plan to get the coworker fired, make no sense. It is certainly an option for the answer to be edited to match the new question, but making edits which require substantial edits to existing answers is explicitly discouraged. Moreover, if we allowed that, then everyone who posts an answer will have to keep monitoring edits to every question that they may have answered ages ago to check if their answer needs to be edited.
However, I wouldn't want a good edit to be reverted to a put the question back into its original controversial state, so I thought it best to recommend that the question be deleted altogether.
I do not feel particularly strongly about this issue, so if the community decides to keep the question and demand that the existing answers be edited to match the edited question, then I won't argue against it.