I have no idea who most of those people are, but some are disturbingly familiar, and I would expect better from them.
Here's one of the parts of the petition that is perhaps most telling.
Roman Polanski is a French citizen, a renown and international artist now facing extradition. This extradition, if it takes place, will be heavy in consequences and will take away his freedom.
Umm...he gave drugs to a 13-year-old girl and sexually abused her. I would hope he would get some heavy consequences from such an act, including having his freedoms taken away by being put in prison.