People can already comment if they want to explain their reasoning. A forced comment would more likely lead to a flood of repetitive explanations, and in genera

People can already comment if they want to explain their reasoning. A forced comment would more likely lead to a flood of repetitive explanations, and in general probably to many low-quality excuses. Because let's be honest, many downvotes are probably not for some high level justifiable reason. At the end, most attendees here are likely just normal humans with normal human flaws and showing the usual social friction. Forcing people to explain themselves, would just open Pandora's box and brewing bad blood.