This is one of the oldest and most plausible Star Wars fan theories currently available online, and it’s a fascinating way to tie everything together.
This theory really fleshes Boba Fett out, and shows us how brutal he’s willing to be, so we seriously hope that a future movie centered on the character makes this theory a reality.
Logistically it makes perfect sense; Fett was on Tatooine at the time of their deaths, and the scene Luke discovers when he returns to his far is far more grisly than anything we have seen from Stormtroopers throughout the Star Wars saga.
There’s a scene in The Empire Strikes Back in which Darth Vader specifically chastises Boba Fett about his use of “disintegrations” in his line of work, and many fans have begun to theorize that this is because Boba Fett was actually responsible for the deaths of Owen and Beru in A New Hope.