What DVD of Ep3 have you seen? you have never seen him kill the children in any release. You only see him find the hiding children and the scene cuts when his saber ignites. There have been no other versions of EP3
I saw it in theaters. In theaters you could clearly see him fighting Jedi children, and it was changed on all home video releases. I know a guy who has a Chinese telesynch if you want proof... LOL (but I'd have to track him down, I haven't talked to him in years)
I guess I forgot to mention where - It's where Yoda says "if into the archives you go, only pain will you find" (or whatever he says) and Obi-Wan watches the replay video of what happened at the Jedi temple. In the DVD, he's fighting adults, but in theaters he was fighting the kids.
The reason I remember this is a real-life friend of mine is also a big Star Wars fan, and after seeing it together I told him how upset I was that they showed Anakin fighting the kids. He bought the DVD before I did, and said "You'd be pleased to know that Lucas changed that scene on DVD"... otherwise I probably wouldn't even remember any other version.