The director looks like a child molester

Different situations. Victor Salva, the despicable scumbag that he is, doesn't have big studios knocking on his door to make big budget movies. Gunn, despite having a known track record for tasteless jokes designed to offend, is contracted to a major media conglomerate that prioritizes its brand and image. I think there are four or five steps of additional corporate BS to the decision, but you get the idea.