Alpha, your rant is ridiculous. In my loco company, all cabin crew and pilots I've seen perform their safety and security related duties diligently. Yes, there is time pressure, but that does not mean we cut corners.
Where did you pluck 30 mins from anyway?? The turn around has been analyzed so that all pre flight duties can be performed in the available time. If the aircraft lands late, it takes off late too because all the pre-flight duties need to be carried out and there is no 'spare' time factored in.
Adequate crew rest between duties, food/drink, duty times, max flying hours per week/month/year etc are separate issues to turn around times. There's some good legislation, and some which could be improved... But I don't really think it's appropriate to this thread though.