Those in the know, construction workers, maids who would cleanup afterwards, security, IT, and other supporting trades behind this—all complicit, no?

Interesting point. I would assume that the people who worked for Epstein were either in on it (higher level workers) or were forced to work there (lower levels). Imagine being dumped there (after being trafficked from Eastern Europe or something) and being told that the only way off the island is to swim for it. You could be a witness to everything that's going on but what choice do you have? If you try to tell anyone - you're dead. If you try to escape - you're dead. If you decide you're going to do a crappy job as a form of protest - same result, you are easily replaceable.