There are a lot of people with a felony record who pose zero additional risk to their employer. Of course it depends on the person and it depends on the job. It certainly doesn't make sense to have a strict policy against all felons regardless of individual circumstances.
It depends on labor supply and demand curves. If it did not make sense, there would be an arbitrage opportunity for an employer by employing felons, but I have not heard of that happening on a large scale, at least at a white collar firm.
I find it ironic, though, to want to seek shelter in BRK to avoid a too tech heavy SPY, when BRK itself has maintained relevancy only by investing disproportionately in AAPL. It would seem prudent to cut out the BRK middleman and just directly invest in AAPL if one wants to emulate BRK’s success.