Exploring new life an strange new civilizations - why? What are we looking for that we haven't found yet? or do we just like strange things? People care about reality which is first and foremost the science.
Ironically Space 1999 handled it right. They treated aliens as they should be treated - extremely cautiously and carefully and seperately and not something to be embraced because they could quickly turn into enemies if they are not already. Hidden ulterior opposing agendas would not be unheard of, especially exotic ones that we can't even conceive of yet, like the Talosians. The Vulcans should be the centalized mystery of the next series with the Romulans and their split or offshoot.