Mistakes happen, fair enough, but a slightly more apologetic tone (considering the disruption it caused) might not be entirely out of place. Sometimes, it's OK to hold your hands up and admit you may have messed up. Or perhaps there is more to it and circumstances were out of your control, in which case why not take the opportunity to shed a little light and correct the 'ill-informed commentary' rather than just attack those who may be concerned about what happened? Presumably the dog was off the lead, out of control, and on the island (which is meant to be a safe area for wild birds)?
... I get a bit tired of the attitude that some dog owners have to the park and to other park users.
Anyway, I'm glad the dog was unharmed.