I completely agree with you here. People should take care about licenses of the software they use, especially in a commercial setup, for all the reasons you stated.

But, you read the license, you decide if you are going to use it or not. That's it. If you are not sure, just don't use it. Use something else if available. Or build your own.

What I don't understand is the basis on which some people complain about the authors choice of the license, and feel offended by his license choice.

edit: s/started/stated/