I vote bomb but wow, indeed, that is a shocking result. I would join others in suggesting that you take photos of more valuable items and then send the photos alongside an estimate of the value of both the bag and its contents to customer service. And like others I think it is remarkably poor customer service not to have contacted you pro-actively to warn you and apologise in advance about the state of your bag and pro-actively suggest ways to get compensation.

As for the floor "littering" in the toilet, I am amazed by how often it happens. I genuinely don't understand how people are 1) so messy as to do it and 2) so disgusting as not to clean after themselves. I am of the opinion that some people should be sent back to potty training just the way those who can't drive properly lose their license!

Please do keep us updated about BA's answer when they see those photos - they should really investigate if they have any sense.