I know people who are against a lot of things. They don’t like this, they don’t like that.
I think there’s a secret (conspiracies, look out) ingredient to add to critical thinking – thinking.
If you’re always negativistic and critical, but don’t balance this with „normal” thinking, I don’t think this is a good route.
Also, if I were to choose between what’s more realistic – too much critical thinking vs. too much optimism, it’s obvious that optimism wins.
On the other hand, optimistic persons start projects, make things happen, and are eager to start things moving.
The best solution? Critical thinking and optimism – a combination. Add to this some intelligence, and, when you need to pick between fear and courage, choose optimism.