Your sphere of concern and your sphere of influence are two different things at the end of the day. If you've decided some social problem is within your sphere of influence, then by all means, take whatever helpful action you can - just do not pretend that this encompasses all problems, or for that matter that the number of problems is not infinite.
Down that path lay depression and burnout.
I don't pretend there aren't infinite problems, or ones difficult to access, but I strongly caution against treating political problems as something that are immovable.