While people must strike a balance between doing what benefits themselves, and what benefits others, that is basically a personal decision. People who work at Google and other tech companies pay taxes, and benefit society in many ways through the positive externalities. It's not for you to say that this isn't enough of a contribution to society.
>It's an opinion, you can ignore it.
If you state it on HN, you can deal with people disagreeing with it, without getting annoyed.