All of those ‘experts’ you mentioned that say it costs too much work for the same companies who are publicly traded on the stock market. They are looking at VOIP as a profit margin and any ‘backdoor’ engineering will not take a significant portion of that margin.

The idea of wiretapping is to prevent criminal acts and possibly terrorism. If you aren’t doing anything wrong then you have nothing to worry about. Let’s protect our country. Let’s protect ourselves.