Nothing the Master does is for the greater good, and you're an idiot for comparing those situations.

Right now they've been three years away from this place, and they need time to resettle. If they are constantly together and undermining that in the initial part, it could be damaging, and enough damage has been done already.

If you, Henry, or Billy had spent three years helping a madman subjugate an entire colony of people, tortured and killed countless, and the other of you simply stood back and condoned it? Never questioned? And one never would have acted without the other backing them up?

That makes the two mutually culpable, and that is NOT love.