Because it would not be as easy to snoop at your surfing as it currently is with IPv4: FBI wants to ban new Internet protocol — RT
I'm surprised they are fighting it. If they let it happen, they will have an excuse to increase their budget (and fuzzy budget math), their personnel assigned and their computer monitoring ability...all in the name of security. SS
I think its the fact that they will have to wait in committee hell before they can get any of that up and how many issues will come from the expansion. Frankly, They should of been around in it before it was starting up. All technology grows and expands.