This approach also allows for the reality that not all "positive" people are necessarily optimists. There's room for all kinds of valid perspectives in this world, and if you limit yourself to people who are engaged in a constant exercise of blowing rose-scented smoke up your butt (extremely common in the US, particularly places dominated by techno-utopian types...), you're missing out. People who make your life better don't always have to be saying happy things to you.

There are few things worse than people who are surrounded with a thick layer of "positive thinkers", who never deliver bad news or critical thinking. It's a fast track to delusion.