TSP has historically been fairly friendly with NPO, and has been allied with them before. Excluding the 2013-15 period between Milo's coup of TSP and the creation and collapse of the "NLO" we've never been particularly hostile to them, or them to us; the purges it led to cleared out most of the people in NPO we had problems with, and relations have consistently improved since then.
I can see an argument that TSP shouldn't ally with non-democratic regions (though it's not one I would support) but beyond this there aren't really strong arguments against it. NPO is no more "dodgy" than the other GCR's.
Minister of Media, Subversion and Sandwich Making
Associate Justice of the High Court and Senior Moderator
Former Delegate (x2.5)
Former Member of the Committee for State Security
Former Chief Justice of The High Court (x3)
Former Minister of Foreign Affairs (x2)
Former Chair of the Assembly (x3)
Former Minister of Security (x2)
Former Local Councillor (x2.5)
Former Forum Administrator
Former Minister of Media