The way I see it, the gun saved his life. Maybe a special gun cabinet, in a place of honor, would be better and less snowflake-y.
There are plenty of AR’s out there if he ever wants one again.
There are plenty of ways Kyle’s many enemies could use that gun, or his future use of that gun, or sale of that gun in what will be their continued efforts to ruin his life to promote whatever insane agenda they have at the moment.
He’s better off with just about any other firearm than that particular one. Not saying it’s right, but that’s the world we live in.