Finals19,
the fact that other cathegories don't get the same checks is hardly a good argument. If there is a law, that law has to be abided by. When you'll get caught for being under the influence, having a ridiculously low amount of alcohol in your blood (but over the law limit) won't make you less guilty. You'll be sentenced to whatever the law states.
Our profession requires us to travel and be subject to foreign laws. It is our responsibility to remain within it. And it is not a mistery in our biz how strict are rules in Northern Europe (and most companies further warn their crew over it). So if you decide to break a law, you must then know you would possibly be called to face your responsabilities.
The media, especially in UK, are what they are and we won't excuse them for the unfair way they use and abuse this kind of news. But being it BA or else (it's not being only about BA lately: that I remember of, there's also been the case of a Virgin pilot, Brunei pilot, America West pilot etc) that doesn't excuse the fact of being caught. If you don't stop for a red traffic light and are fined, and the guy who did the same before you could get away with it, it's only bad luck, but your responsibility nonehteless. You gambled and lost.