In the MU case, setting aside the unsavory aspects of Kim Dotcom, they were well on the other, illegal, side of the letter of the law.
But in both cases, the defense of the behavior comes down to legal technicalities, as opposed to broader concepts of "fairness" or "ethicalness."
Really, it seems the same with Google, as long as they comply with the DMCA they are safe, but I doubt they care to much about the wellbeing of content owners whose content is being infringed and accessed through Google. That's money in the bank to them.
I'm not trolling, just curious as to your thoughts on this.
FWIW, I do support the concept of intellectual property. But I think it should be enforced against for profit entities, and take a live and let live when it comes to individuals copying for their own use. It's messy obviously, such a distinction might not be able to be enforced.
But I don't think it's as much a case of ethical behavior as other laws address (laws against violent crime for example).