In a shared apartment, should a tenant have to pay for damages they were not involved in?

Okay, so I am living with 3 other college students (we’ll call them A, B, and C) in an apartment. I share my room with roommate A and the other room is shared between B and C. Mind you, roommate A and B have a very bad blood between each other (if I would’ve known just how bad, I would have never even considered living here). The situation goes as follows:

Before I even moved in this apartment, roommate A throws a “get together”, in which one of the guest’s… we’ll just say had a “bed wetting” problem on roommate A’s bed. This is the first incident – I wasn’t involved at all. A month or so later while I was at home for the weekend, another “get together” in which the same thing happened – the same guest peed on the bed and allegedly the floor. He replaced the bed sheets and shampooed the floor. Once again, I wasn’t involved.

Today, roommate A discovered that roommate B (sometime after the second incident) went into our room (without our permission) and took photographic evidence of the “incident” and brought it to the apartment office and demanded that me and roommate A pay for a new carpet replacement, meaning we wouldn’t be getting our deposit back.

Is my anger justified? I wasn’t involved in either of the two incidents, what sense does it make that I’m held responsible? If the reasoning is only because I’m a tenant, than shouldn’t all tenants in the apartment be responsible?

What bothers me is that this has nothing to do with a “clean carpet” – it’s a stupid, ongoing, petty feud between roommate A and roommate B.