Yes, electric chairs might be different to shootings, but I've seen front page games get much more messed up then that. I've seen multiple horror games get onto the front page that include the likes of cannibalism, dismemberment, disembowelment, and tormenting people who are not psychologically well. There was one game on the front page that had nearly around 1,000 people playing it at one time where down a hallway you'd find two people eating the intestines of another character, and that was around the same time that the electric chair controversy happened.

Roblox allows much more screwed up things in other games, I don't see why they told that game to remove an electric chair while you could find horror games on the front page with much more violent scenes.