alt Hacker NewsMozilla and Wikipedia for example are causes I support. But why would I give money to them if they are going to turn around and give money to some cause I don't support (OR am actively against)? These non-profits love to shuffle money around to unrelated causes. As a non profit, supporting open source software, I think expecting a large percentage of the donation to go to engineering and not admin, social causes, etc. is a reasonable expectation.
Yes that's all reasonable but the comparison is paying for (or giving them other revenue) corporations who also love to shuffle money around and can support causes you are actively against. The point being made was that people give causes trying to improve society more scrutiny than they give for-profit mega corporations who have in the past shown that they use their money for a lot of things detrimental to society.