You could be hiring a murderer. Or you could be hiring literally anyone else. These jobs are in demand. There is no business reason to do this and there sure as hell is no ethical reason. I'm not saying: don't hire a murderer. If you have a cleaning job or something that just pays bad and you can't find anyone else, sure. But don't go bragging about how you are giving a murderer 100k a year. A lot of capable engineers who are not a murderer would have been happy to get that job.