After reading all the replies I don't think anyone so far has a problem with the "collateral damage" as you put it, we all accept that.
I think the big issue here is whether the photos needed to be posted on the PUBLIC part of this forum or on Facebook.

I've shot my fair share of 'roos years ago (under permit) and you always got a few joey's in pouches, had to happen, usually the nearest bullbar or tree sorted that out.
I don't see that as being cruel (infact the opposite really) and in long grass, no-one can tell if a doe has a joey in the pouch or not.

As someone put it to me yesterday, it's like giving someone a stick so they can then flog you with it.

David.