Well of course? If you didn't like a country and a president running for reelection had a history of and policies leading to a waning of that country, why would you not support him? Hell, he campaigned through the world during his entire presidency, apologizing for America.
Notice the full description of how the accident happened, the details of what the mother thinks happened (she is emotional and has is not expected to know what the police are saying at the time of that statement), and the tirade of comments demanding that the officer be put in jail regardless of the facts, saying that things happened even more troublesome then what the mother believes.
The grenade wasn't thrown, it was dropped because the dummy thought it was a dud. The department should pay the medical fees and a little bit on top of that, issue and apology, and it should be done.