Fear is iron chains that bind us.
Hope is gold chains that bind us.

Without hope in a future outcome, it is almost impossible to achieve any motivation towards a goal.

But "hoping" that some bad outcome, that is likely to happen, doesn't happen usually ends up in tragedy.

Hope is the thing that will get you over those hurdles.
It is a faith placed in the future aligning to bring you what you need on the path that you are on.

However, as you have said, if you use hope to blind you to red flags, you are going to get hurt.