Phantom Thieves Opinions?
This is a really interesting topic. Changing people's heart can be a really dangerous thing, as we all saw in the mental shutdown cases, and having that power is a bit too much for a normal person to handle. The only way that the PT can use that power without becoming dictators is by voting to decide if they actually should change the heart in question (as in being too late to redeem itself if not with an heart change) and only going for unanimous vote. They should also have a team that has multiple elements coming from different backgrounds, to actually cover the judgment from various positions. Having a Lawyer and a pro judge in the team is indispensable to give a fair treatment, and a Detective could help proving the actual fault of the criminal. They should absolutely not have connections with the government, as to not become controlled for political use.