It's not damaging to England
because it was KP who said it.
However if Strauss was dropped as ODI captain (for e.g.) and came out and bitched on his Twitter or in a press conference about it, it would clearly damage the team.
Strauss is pretty deadpan boring at times. But he does what is right for the team
Sure it's be great to have more Ajmal-esque interviews to add a bit of spice to the game. But inner-fighting and complaints is never a "good thing", despite it being interesting to read.
In this case it wasn't even interesting to read. It was just "oh KP isn't happy being dropped". At least Afridi hitting Asif with a bat was something entertaining. Even more entertaining now