In Empire Magazine, Lethal Weapon director Richard Donner (who, as I know all too well, once made the wrong choice about Lethal Weapon 3) recently showed that whatever understanding of Riggs and Murtaugh he may have initially had is now completely gone:

There was a fifth one that I would have loved to have made. Shane Black wrote another treatment, which I never saw… But we had a totally different story. The two crazies decide to cool their lives, but it’s impossible for them to stay out of situations. It starts with Riggs and Murtaugh out in the country in a motorhome. They’re on a trip and they stop to get gas, but Roger forgets to put the brake on. So the motorhome rolls through a village, annihilating everything, and they get in serious trouble…

Sure, Dick, you definitely showed in the latter films you know better than Shane. Heck, just cast Rob Schneider and Martin Lawrence instead of Gibson and Glover and go for it. Or better yet, just make Little Weapons  for Nickelodeon…

"I'm still too young for this poop!"