Essay
The first positive is that it’s better for the environment. Dead bodies decompose and smell awful so hiding one anywhere that's not the ground is a bad idea. Dead bodies also improve soil quality and conserve energy because corpses are renewable.
https://caringplaces.com/what-is-human-composting-giving-back-to-the-earth/#:~:text=The%20Benefits%20of%20Human%20Composting&text=It%20improves%20soil%20quality%20by,nutrients%20and%20preserving%20nitrogen%20levels.&text=It%20conserves%20energy%20in%20that,pollutants%20to%20enter%20the%20environment.
The second positive is that criminals are punished more. Killing someone on purpose or by accident and hiding the corpse is a misdemeanor and can land you at least 3 years in prison. Under no circumstance is hiding a corpse necessary or reasonable.
The third positive is closure. How would you feel if someone stole the corpse of a loved one? I bet you’d be angrier then your wife when you leave the tiolet seat up. Stopping someone from stealing a corpse allows the realetives of that corpse a chance at a final goodbye and allows the soul to rest in piece.
My one negative is being framed and or forced to hide a body. The only downside i can think of is being arrested for being forced to hide a body by some criminal.