I don't know why some people are resisting regulation. I think regulation is almost inevitable. Bitcoin has gained value and we can buy things with it. Bitcoin is not digital coupons any more and millions worth of bitcoin are trades every day and can be transmitted across the world. Regulated exchanges are important to bring bitcoin mainstream. The more regulated exchanges around the world the better.
In California, some would argue that buying and selling bitcoin to your friends even if you don't hold their bitcoins for them requires that you pay $5,000 to register for a license, then pass a rigorous background check, then pony up a substantial dollar based $200k bond. No real explanation as to why these things are required except the word bitcoin needs to be added to the existing laws.
Appropriate protections for consumers are fine, but the regulations so far proposed only serve to neuter bitcoin's innovations and prevent the established players from being displaced.
This is why bitcoiners are resisting regulation.