Is it wise to marry someone who is unhappy?
Is it wise to have children with someone who is unhappy?
Is it wise to employ someone who is unhappy?
The worst case scenario would be to get involved with somebody who is unhappy AND delusional; whose delusions and unhappiness reinforce each other. Optimism, on the other hand, can go a long way; much further than pessimism. Negativity is oppressive. Positivity is progressive. I would rather be with someone who has a generally positive outlook on life than a person who dwells on the negative aspects of everything.