My theory is that Moosecat and Siggie are seen as aggressive and competitive - if they get into trouble it is in the context of an overzealous tackle that had to be made at the time. In contrast Griffiths is seen (in my theory) as a player with a careless streak, and more of a "loose cannon" prone to do a stupid unnecessary thing when none was called for just to wind up the opposition. Others may disagree.
My theory is that Moosecat and Siggie are seen as aggressive and competitive but if they get into trouble it is seen in the context of an overzealous tackle that had to be made; in contrast Griffiths is seen as a player with a careless streak, and more of a "loose cannon".