I also want to reiterate this. We don't want ANYONE to fail. Nobody wants that. If somebody DOES want that, they are a miserable person who shouldn't be in academia. We are here to help you succeed, and we WANT you to succeed.
I know from a student perspective it can feel like that sometimes - when exams are tough, when questions are tricky, when the work piles up. Maybe you have a bad encounter with one of the bad academic apples, and you think all professors are jerks. Heck, I grumbled about stuff like that myself when I was there.
But now that I'm on the other side as a professor, its very evident that the opposite it true. We don't sit in our offices and gloat over and snicker at people who struggle like we are some bunch of evil overlords - we really, truly want everyone to succeed. Please don't be afraid of or intimidated by us. Or if you have had a bad experience seeking help from professors before - don't let it color your perspective. The vast majority of us are normal, good people who got into academia because we want to help students make it.