Point 1: You didn't go Godwin on "removal of private gun ownership", you did it on mere registration. Changing parameters to defend your point is bad arguing too.

Point 2: I'm a pro-gun liberal. I'm also opposed to gun registration. I kicked you around on it not to support gun registration, but rather because you're making my side of the argument look bad. I don't want the people I agree with making crappy omg hitler!11!! arguments because it makes my job that much harder.

Point 3: If you can't show how gun registration is bad (or ineffective, which is my usual tack) without saying omg hitler, you're not going to convince anyone that you're right.