Plus, everyone should be buying these bundles (even a few cents) and donate it all to charity. It's for a good cause.

Exactly. That is why the Humble Bundle TOS cover it in their official wording, and their FAQ pages say it in layman's terms:

Please consider your bundle a "unit", and not to share copies of the games or Steam keys from it.

If you'd like to give a copy of the games away, we have a system in place that allows you to buy a gift key from www.humblebundle.com so your friends can have access to direct downloads as well as any Steam or other keys we have included.

Also, I don't think "complaining", as you call it, is unreasonable, because the problem is not with where the games are going to ("free game"), but with where they are coming from ("copies of software obtained by breaking its TOS").