I think that Snape should be trusted. Not just becasue that Prof. Dumbldore does. I believe he can be trust (at least with harry) because James Potter (harrys dad) saved Snape life. So now i think that Prof. Snape is trying to give the favor back! But who knows? Some people think that he is mean (Harry, Ron) then others think that he is awsome (Draco).