Kill them now or later????

Okay I sent Daniel and Nathan to their room the other day for being in my bedroom watching tv without permission. It one thing to have permission but that is my space. The one and only place that little children should not have any kind of influence or have any trace that their are children there. (As much as I like that idea there is still always someone's dirty underware or train or toy in our room) So I had not heard them ask to come out and they were very quiet so I decided to go see what was up. As I walk in the room this is what I see. And Nathan had the fan on fanning this crap everywhere. It took them a good 2 days to get it cleaned up. With no dinner one night and a very late breakfast the next morning. They have not been this destructive in a very long time. This stuff is the "beans" in a bean back chair. I walk in and Daniel says Nathan made the hole. And Nathan says Daniel helped me make it bigger. Do they think that if they blame the other kid that is going to help their defense or something? I just don't understand why kids do that. Their bedroom is always so disgusting. They will get it so nice one day and then the same very night I will walk in and its a disaster again. I wonder if it has anything to do with having 3 big boys in the same room together.
OH by the way they survived and were not killed-this time :0)