I know! Why don't you ask Paul Richard Polanski about it?
suzycreamcheese RIP Heath Ledger 1979-2008

It's been done right twice:
Helter Skelter (1976)
and
Helter Skelter (2004)
. And screwed up worse than a rusty coat hanger abortion every other time. It could be good, but it could also end up like the rest of the Manson fanfic rubbish out there. Why run the risk?
Personally, I'd rather see a "Doom-Head" biopic. I think he does better with his own source material.
"In a time of universal deceit,
telling the truth is a revolutionary act."
George Orwell

There have been tons of TV shows and movies about this subject already, but one more won't hurt. I'd love to see how Rob Zombie would approach the story. Almost all of his albums and movies have references to Charles Manson, the "Family," and the murders so he's clearly interested in the case. I can't think of anyone better to make a Manson movie. I imagine he'd show the murders in graphic detail so you can feel as though you're actually there. It would really show how horrific and heartwrenching it all was.
He was actually approached to do a TV series about the murders with the author of American Psycho but it was dropped shortly after it was announced which is a shame.