In some states the order will curtail your right to purchase a firearm or, possibly, to exercise other 2nd amendment rights. Depending on your circumstances, this might endanger your life. That the courts can eliminate some of a citizen's rights based on an unsupported complaint with no due process might not be considered reasonable by everybody.
"I've just broken up with my girlfriend, it was a pretty messy event and now she's got a temporary restraining order on me... And this really pissed me off. So as an obvious next step, I went to go exercise my rights via purchasing a handgun... only to find my 2nd amendment rights had been taken away! What's become of blessed 'merica?"
The reason for this is that there is a strong possibility that person could be acquiring a firearm to assault or murder to the person who filed the restraining order. A temporary halt to your ability to purchase firearms in sensible in that circumstance.
