At the end of the day, they have money. Assume they are selfish and want to not lose money, so they probably have some rationale on which they give out money in hopes for a return on investment. That being said, I've seen way too many tech bros with bad blockchain ideas get way too much money which usually goes straight to their heads before they lose it all, and I assume the V.C.s have a really good strike price and know exactly when to liquidate.
For others, it was my general understanding VCs lose money on most investments, hoping that a few end up going really big and canceling out the losses on the rest, but I don't really know anything about VC stuff. I'm not sadomasochistic enough to try to start a company, I just try to work on my skills and people are willing to pay me to invest in myself because I tend to discover interesting things while I tinker about and also keep things from failing often in a raging dumpster fire but I don't know if thats a good way to market my skills.
It's a relatively small percentage of jobs that require people to be good at manipulating the opinions of others. As you say, marketing is an exception to that, but their business is manipulation, so that's not surprising.
I have friends in healthcare as well, and I don't hear things are much better too, in regards to the business ethics of the healthcare system.
My overarching point is that anything that involves finance is likely to be corrupt, and VCs are just one segment of them, but there are a lot of more corrupt financial entities with way less transparency and as a result, way less criticism.
It's not really a fair comparison to match factory work, cutting hair, and being a cashier to being a hero of honesty in relation to finance related jobs. Take cashiers for example, their job is to accurately ring up listed prices decided by a much more complex decision making system, leaving very little decisions for them to mess up at that point, and anything they do unhonestly, is likely to be relatively black and white in comparison to the unethical lobbying behaviors multi billion dollar corporations that bankrupt farmers that farm the seeds they make to monopolize food markets, that the cashiers are ringing up.
Yes, VCs are able to lose alot of money and not really be accountable for it, but so are many other industries related to finance...
Not sure why you are so convinced VCs are the one evil entity in the thousands of permutations of finance, but if I had to call out evil entities in finance it would be the credit market, corrupt government, wallstreet investors, but atleast somewhere at some point VCs gave value to some entity you can track other than transiently through a stock from an algorithm to maximise their profits, but I get it, you hate VCs.