Yes, it is possible, as in it is conceivable, that a certain philosophy can be harmful.

I don't think the question that interesting. It seems similar to asking, "is it possible that aliens exist." The answer is yes, but that's not what we're trying to ask, we're trying to ask, "Do aliens exist?"

I wonder if you mean the question to ask, "are there philosophical questions that are harmful?" And that seems more interesting since we have to the define "harmful." Do we mean physically harmful, psychologically harmful, etc. Lastly, Doesn't this definition of "harmful" depend on a specific philosophical position which not everyone agree with?

Just putting those out there, fun question.

Thanks, that's helpful, is their a source that gives a list of all the different kinds?