The stuff ATPL's usually get into trouble for are usually directly related to company infringements and the company gets done.
Unless you work for ryanair then its in your contract that your liable for any fines etc.
The other thing is that most ATPL's will be able to bring in a raft of technical witnesses. The likes of the BHX case would get pretty techincal very quickly and cost a fortune.
But in general the enviroment we operate in there is less chance of screwing up. You get the odd few that bust noise and get a snotty letter and a fine but apart from that its dangerous goods and stuff like that that comes up and if the ATPL hasn't been given the correct info in the first place the system is at fault not them.