Is that because you think ISIS should not be fought militarily, or because you think tactically a ground strike would be a better approach, or what?
I think it's more the flip tone of the message.
Maybe something to do with the location being in the middle of a city full of civilians.
It would indeed be the perfect weapon for a terrorist. Just post a picture of something on the Internet and have foreign military blast it to the ground. Create terror and blame americans, and anyone can do it.
Do you really expect someone with the authority to make a strike is going to post about it on the internet?