I disagree, I think basing emotions off of positive emotions is better then basing them on negative ones (but there should be one of guilt).
For exemple, hope sounds like a good feeling, but false hope is dangerous. The best exemple I found for this is a reballion. Every participent hopes that their reballion will succseed and takes great risk. If the reballion fails, they end up worse then how they started - dead or imprisoned. Hope can push people to act in a destructive manner if there is a slim chance of succsess, and lead to their downfall.
Courage can lead to self destruction in a similiar way, but technically not an emotion but ignoring fear.