How exactly does that cater to only one side of the political spectrum?
If Tor is to remain as an acceptable thing to run and use, the Tor Project can't outwardly espouse ideology that drives away the normal users that allow Tor users to blend together. Those browsing Tumblr over Tor, shitposting on Reddit, watching YouTube, etc are key to retain so as to normalize the use of the Tor Browser Bundle.
And even so, note that that is not the same as blocking 0.15% of users, which is impossible.