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How to explain the rise of so many incompetent and unprincipled people?
Easy. They could never succeed on their own merits. As soon as their incompetence became apparent " which was likely to be as soon as they took the first job that required some degree of intelligence and integrity " they were fired.
So they learned that to be rewarded with promotions, money and power, they cannot rely on the normal processes and systems of recognition for jobs well done. If they're to make anything of themselves, they must instead become ass-lickers, lap dogs and sycophants.
They must latch on to someone who values loyalty above integrity or competence, someone for whom fawning obsequiousness is the most important criterion for being hired and promoted, ideally someone who cannot tell the difference between a groveling toady and a knowledgeable adviser.
Enter Trump.