For without against?

I’m wondering if, for every thing a person is in favor of, it’s necessary to be against something else, or if it’s possible to be for something without a corresponding against.

I’d like to think it’s possible, because it seems as though it would be very good for humanity if that were the case, but as I flip through the various things I’d say I’m in favor of, I’m consistently finding corresponding againsts.

So then I get to thinking about what we do with our againsts.  And our fors, for that matter.  If there does have to be an against for every for, are there ways to manage the againsts that will bring more and less of what we’d like to see around us?