Did the titans have the right idea?
Could they have been the heros we needed, i mean they made the barzam so they can't be all that bad
Did there need to be a force to clean up the mess after the war? Yes
Did some of the honestly believe in what they were doing? Yes we see a good number of them have honest intentions
Did the leaders always plan to do more and were always going to be corrupt? Seems that way
The concept seems a little vague in some respects. Obviously, the Zeon remnants on Earth and Space, and very briefly the Republic of Zeon proper, are still a military threat to the postwar peace.
The problem with the Titans is that they (or at least the whole leadership) LITERALLY do the worst thing possible in that context--align with the Zeon to fight their own enemies (including those within the Federation military).
A necessary task probably, but literally the worst people who could do that.
But then I can't launch my thinly veiled coup after the parliament have given me total control of everything including purging them.
No, it's okay. I have a plan that has all kinds of oversight involved.
We'll clone you about a thousand times, stuff the clones into the Macross, and send it out to fight space enemies. It's brilliant, right?