RIII was a child-killing murdering despot.
I think the bottom line is that Richard III (and indeed Henry Tudor) were products of their time. They lived in a hard and brutal world where “might made right”, in a country scarred by two decades of vicious civil warring, with all the break up of social cohesion that goes along with that. Its hard for us to judge that - by our modern standards they were both monsters. Were the princes murdered? Almost certainly. Who did it? We’ll probably never know - but logically it must have been on the orders of either Richard III or Henry Tudor.