To answer your first question, that sounds to me like arrogance and selfishness. It shows a belief that you think you know better than others, and because of that you can put those resources to a better use than the people who were exploited would have. I think that that attitude is often harmful even in people who think they have good intentions.

You should try to use your best judgement to decide how to best spend your resources, but you should not force those choices on others by taking their resources and redirecting them towards what you think is better.

As for "opting out of the economy", I didn't advocate for that. To survive, a person has to interact with the economy as a worker and a consumer. However, a person does not have to interact with the economy as a shareholder.

There is no ethical consumption under capitalism, but you must consume anyways. There is no ethical investing under capitalism, and you can choose to put your money elsewhere. That is the difference.