The Chinese government banned ICOs. Naturally as a result, alt coins started dropping. People are fearful they won't be able to get their money out with the government cracking down.
For the next couple of days I think it will blow over and go back up, but only time will tell.
I agree with you that if one industrialized / developed country have fallen the ICO everything will in account will also fall. But it does not mean that bitcoin is fail and will be stable as falling down in a London Bridge, I know maybe time will only tell when will bitcoin will rise and gets stable and up again.