it’s some plot holes/stupid stuff I noticed watching. Here’s a comprehensive list , I can’t remember anything specific because I watched it about a year ago and you know, flippantly.

tvtropes.org/pmwiki/pmwiki.php/…/DeathNote

One part of my perception of Light is that he expects killing every petty criminal would solve all crime forever and that society would evolve into worship of him or something stupid like that. He does nothing to address actual social ills or people with enormous amounts of power or anything like that. Other similar holes in logic, putting himself in many contrived and risky situations , the final showdown, etc etc.

Also, the show was very much a product of the post 9/11 world and its views on justice and human rights abuses.