Great question. Let me preface my answer by saying I'm not a Wiccan, I'm a Pagan of the ecclectic variety.
A few things I'd like to say first. When people get arrested for heinous crimes, all sorts of people pop up with all sorts of stories. I don't believe much of what bystanders say about the things Damien supposedly admitted to. I do believ he has mental health issues and is in need of therapy. But, I don't necessarily believe the words of people who tried to spin a Satanic ritual murder out of this case.
Wiccans in PL2, it's been ages since I saw the docu so my memory is a bit fuzzy. I think that just like every other faith, Wicca has its share of flakes. I think film makers would be better served to find some down-to-earth Wiccans and talk to them. Don't just grab up the clad in black, clutching your "book of shadows types and call it all good. I"m sure they'll get right on that just after they stop grabbing up the Bible thumping Christians and showing them instead of the mild mannered ones. Second Tuesday of never would be about right. Some of the Wiccans they talked to knew their shit, others didn't. It's generally my wish that we stopped being portrayed as a bunch of flakes when we aren't (Wiccans, Pagans, Druids etc..). That's not a PL2 specific issue. Then again, when we stop acting like a bunch of flakes, we've won half the battle. If they makers wanted to show Wiccans as just your every day type people they did and they didn't. But, it's also how we sometimes portray ourselves that causes damage. I'll have to rent the docu again and give you a better answer once I've refreshed my own memory.
Sorry, I'm rambling this morning. Pain killers and whatnot. I'm also a bit bitchy, so if something I said seems caustic or straight up bitchy, it's not intended that way.