I agree that people who are capable of doing high level work should do so, but the comparison shouldn't be a high-powered lawyer vs. picking up trash, it should be: being a high powered lawyer vs. being a "high-powered leader" of a social movement. If Gandhi had decided to continue being a lawyer and donating his profits to charity, there's no way that all the cheap labor he could have hired would have added up to the kind of world-historical moment that his life did.