It just doesn't sound reasonable that Qui-Gon's death triggered Dooku's fall to the Dark side. Qui-Gon was killed by a Sith, so Dooku goes off to join them? Doesn't make sense to me. I think that Dooku just decided that the only way to save the Republic was to go to the Dark Side. Hmmmmmm, where have we heard that before? Anyway, once he went to the Dark Side, everything he did was filtered through the perspective of gaining more power, which is what Sith do. From his POV he was doing the galaxy a favor by helping to unite it under the Sith. I really, really don't think that Dooku knew anything about Order 66. Of course, he expected many Jedi to die in the Clone Wars, but I think he expected the survivors to be offered a chance to join the Dark Side once the Sith won the war. Hmmmmmm, I don't think that Dooku and Padme have anything in common.