Let's say we did sink it, SO WHAT!
IF they get so close to us that we get nervous or either side bumps another, someone is going to pull a trigger and I say better then than us.
So if it was internal, again - so what. what's done is done, it's over and that's that.
Think of it like this, they just released this information? imagine when they release the UFO data or we get a visit one day and they fess up to having captured alien craft - imagine that uproar. Even better, imagine what would happen if the JFK files was opened and we knew the truth about who and what.
Every day we engage, there is a air to air incident on a daily basis and from time to time we get on the edge of downing a plane. This stuff happens so I can't see what the big dead is.