Are ATPL holders never prosecuted by the CAA or are they just never in the wrong?
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.
An ATPL has to be spoon fed the correct info. Once they are allowed to operate outside the company environment - flying a club Cessna 150 - they are more dangerous that the average PPL. Because they are spoon-fed Notams, weather, at work, they don't bother checking these when flying as a hobby and so try to land at airfields NOTAMed as closed due to flooding, etc...
They are part of the professional club in which the professional never makes mistake. It is only the hobby pilots who screw up so the CAA's go after the hobby pilots and make an example of how the CAA's are protecting all the airliners from the menace of the infringer. The ATPL will get his knuckles tapped and allowed to continue to earn his 6 figure salary.