The question isn't really a dumb one; remember, Ra's Al Ghul told Bruce that the death was his father's fault. He mentioned something along lacking the will to act.
Granted, in the film, Chill was ostensibly referred to by Alfred, but in certain post-traumatic situations, surviving victims have been known to lash out and blame not only the assailant(s), but the deceased as well; sometimes, it's part of the grieving process.
It is in the wrong forum C1, but it was a very prudent question that belies the philosophies of fear, revenge, justice, and the overall balance of them in life.
Alfred may not blame them[his statements are proof of that], but does Bruce? [Bruce probably blames himself in a lot of ways, not only as the young kid who cried to Alfred and proclaimed fault, but as a grown man who's taken a personal responsibility in battling this kind of thing.]
When he was talking to Ra's, he defended his father's guilt in the murders, but perhaps Ra's line of reasoning caused Bruce to secretly harbor resentment, or the familiarity of 'what if' towards his father's inability to save or alter the situation.
Notice also that Rachel didn't just harp on Chill, but she brought the societal problem of Gotham to the forefront[as another reason for what happened]; she showed Bruce a different side of Gotham that he might never see, and as Carmine Falcone pointed out, he'd never understand because he was a silver spoon prince of Gotham. Economic needs would never confront him.
My question is do you guys think alfred blames thomas wayne for their death and being to passive?
No Alfred doesn't, but we'll have to wait and see the trilogy unfold in regards to Bruce's personal feelings. At some point in the next film, or the following sequel, he may experience a time when he lashes out in bitterness. Only the writers know if they'll utilize that resource material.