I once was lost, but now am found;
Was blind, but now I see.
They don't like it because they don't get it - they're still blind.
I am so sorry that you are going through this. I have had similar frustrations and pain from them with two funerals in the past year. That anger just wells up and is so hard to deal with - venting is really good - I would also recommend that your wife see a counselor - I tried to deal with the anger and hurt on my own but after a while I finally realized that a counselor would help me sort it out in a positive way.
By the way - a little off the subject, but there's another line to Amazing Grace that answers why JW's just lip-sing or mumble their way through songs while you see other churches that sing out loud. I believe it is because JW's sing from a heavy heart, one that is desperate to be saved. Other's (like John Newton who wrote Amazing Grace) sing from a heart of joy that knows it's already been saved.
Amazing grace! How sweet the sound
That saved a wretch like me!