First off let me say I am very sorry that Arthur is gone.

Now, I Know that I am going to get slammed up one side and down the other, but I feel I must say this and please understand I'm not trying to be mean.

No, I wasn't there to know exactly what happened. But I went back and was reading your posts on the agression and from what I read, it was Charlie that was causing the problems. Even being mean to Anna. So no, I can't say I understand your decision as it sounds to me that the only thing that set Arthur off was Charlie.
I personally feel that he could have been a wonderful dog in a home with no other dogs. I don't remember you ever saying he was agressive to the other dogs or any people at all so I don't see how he could be "wired wrong". But who am I to say.
Please don't hate me for feeling like this, but you put this out for all to see and this is just what I see.
Yes, I'm sure it has alot to do with my love of rotties and just loosing our Angus, but I just can't help the way I feel.

Take it or leave it, but this is just my 2 cents.