Okay, the JoJos can be...violent people. Of course, that style of interrogating people who may or may not be innocent is in common use among rough and tough characters (Batman and Jack Bauer are quite guilty of this). Expecting Jotaro to be a paragon of virtue is kind of a tall order (he's already supposed to be borderline misanthropic). Of course, I can understand why some of the Toonami faithful are missing genuine all around good guy characters (having one saccharin power of friendship show would probably appease a lot of fans. Toonami, find one already to balance things out!). Okay we do have Kakyoin as this show's nice guy and the cast of Dragonball Super are quite friendly and Gon is mostly a nice kid (although we have some people who pick on him here. You have to be a total paragon it seems to avoid criticism from some people). It looks like the dark Toonami protagonist issue is a little exaggerated, but Jotaro and Mikazuki are admittedly violent and rough characters who paint the block as pretty grim.