So if you understand the mechanics behind it and have a reasonable path to return, say at least 5x the capital in 5 years (they want more obviously) then VC may not get in the way of your mission. But you have to ask yourself the hard question and be honest in answering it: "Can I return this investment five fold in five years without harming my customers/users/business/etc.?"..
Ethical obligations go in multiple directions.
[edit to add] Obviously there is also a fair amount of dihonesty and ill-intentioned greed out there as well, but that isn't the driver.