How do I convince my parents to kick my brother out?

Solongsolo Asked: How do I convince my parents to kick my brother out?

My oldest brother is deluded, he kicks off and winds everyone in the family up and causes huge arguments and fights, then when everything is over, he acts like nothing happened, expects everyone to be all right with him and wonders why there is an atmosphere in the house or insists he had no involvement.

This is no petty family squabble, my brother is 28 and is built like a gorilla but has a mind of a 12 year old, also he's never had a girlfriend, earns 20,000 a year but wont move out. What's worse is that my other brother has joined the army so we have no one to protect us if he ever has rage again, because he can over power our dad and has fought with me and my sister before.

I had high hopes for him to move out and find a girlfriend after he graduated but now I have lost all hope in him and I have no sympathy for him anymore, he is in total denial and will never except that he is in the wrong.

It is like everyone is walking on egg shells, my siblings and I have tried and tried to convince my parents to kick him out but they wont listen, my dad says it's not as easy, it is like they would rather be miserable and put up with abuse than have piece of mind. I'm so scared that he'll end up killing one of us in the end.