Well we don't know what happened.
I wish we did.
In all honesty this story is so ambiguous this story could go either way. Until I get something other than unreliable hear say, I will not pass judgment.
This story could swing anywhere from; the man hued loud noises out side, so was sitting ready with his shotgun in his living room, then police charged in, without notice, felt endangered and shot him, if this is what happened, the police need to PAY! Or; the Police had a search warrant for the man's Grandson, when they arrived they banged on the door, yelling, "SEARCH WARRANT", the man then opened the door and opened fire with his shotgun, missing the police officers, but police returned fire, the man was wounded, and is being charged. Then I would say the man deserves being charged.
But like I said we just don't know right now. Whomever is wrong in this case is the ones that need to be charged, whether that be the Homeowner, or the Police.