Best investigative tools on the planet for law enforcement are facebook, twitter, and instagram.

Anyone who fed that moose caused this to happen. Sorry, but if I see a moose or bear roaming, I'd get my gun just in case too. This assumes I dont already have it. Toddlers and babies can't run. And I bet most of us can't outrun a moose regardless. 

Sad that all it wanted was it's meal and when it didn't get it became aggressive. 

Hinsight on what you should have done is easy. Like bringing everyone inside as soon as the normally friendly moose appeared. Assuming there was even time for that. Anyone with a group of small kids knows that isn't quick.