Honiley, I'm afraid that you're incorrect.
The answer to your first question is most likely because they can and because they want to and is also likely to be none of your business. I'm pretty sure most people are sensible enough to ignore the bitter ramblings of a has been and do some research when they're making career choices and in the end the decision is theirs to make.
The answer to your second question is yes, it does ring some bells (a phrase which means "sounds familiar" by the way). It is reminiscent of what happens at every other airline in the world. People leave, people join and it's a perpetual cycle with peaks and troughs. I'd hazard a guess that your poorly constructed, grammatically incorrect bovine faecal matter won't stop it.
How long is it since you left anyway? You're thoroughly out of the loop and irrelevant chap.
Ta ta.