Anger is an acid that can do more harm to the vessel in which it is stored than to anything on which it is poured.
It's important for that to exist in a society that doesn't present you with any genuine problems.
Freud's view is that all love is sexual in its origin or its basis. Even those loves which do not appear to be sexual or erotic have a sexual root or core. They are all sublimations of the sexual instinct.