Of course, the sniper should not have been shooting at someone retreating anyway.
The Ruby Ridge Case brings up a number of points:
1) Law enforcement organizations are famous for NOT communicating or cooperating. A civilian who thinks he has some kind of agreement with one LEO is often surprised that another LEO hasn't even heard of it.
2) Things like killing dogs when involved in a standoff often spark firefights because owners are very sentimental about their dogs.
But you can't expect a law enforcement officer to risk their lives just to avoid killing a dog.
3) Domestic law enforcement tends to be too much in love with using informants to provide basic information.
4) Once a member of law enforcement is killed in any kind of confrontation, it is usually all bets are off regarding procedures. Law enforcement officials naturally feel both afraid and vengeful.