...Probably because his job was threatened if he didn't. He's still an asshole.
From Media Matters: ...I'm sorry that some took my comments as anti-gay and insensitive. I'm aware that Ledger has a family and many fans who were grief-stricken by his sudden death.
As I speak, a crowd is gathering at the funeral home where Ledger's funeral services will be held. Those who knew him say he was a good actor and a loving dad. And what happened to him was terrible, but was evidently an accident. Once again, to anyone offended by my comments, I'm sorry. But I'm also sorry that Heath Ledger is no longer alive and with us.