Getting rid of the "crabs in a bucket" mentality might help.
Though I'm not sure even that is possible. I've seen too many people who have to drag others down so they can feel better about themselves; too many who don't want others to have something if they, themselves don't have it; too many people who can't seem to think outside their own "safe and secure" bubble.
Too many "crabs in a bucket" sitting as frogs in the slowly heating water. (How's that for mashing up metaphors?) 
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