Blue people are Lizardman. Lizardmen are blue. Tau are blue. Are they not both for he greater good? Blue is the colour of awesome. Blue. BLUE IS AWESOME. TAU ARE AWESOME. LIZARDMEN are ok. I mean awesome. You didn't see that. (tau would wreck)
But their blue awesomeness mixed with the awesomeness of their hats look over that fact. Too much awesome