A comparison with Nazis is often just a Reductio ad absurdum, and it's particularly effective and useful because despite how absurd it sounds, it actually happened.
If you think the reduction is inaccurate, then argue the point, but just dismissing it by calling it Godwin's law, in my mind, admits that you don't have an effective counter-argument.
If you think the reduction is inaccurate, then argue the point, but just dismissing it by calling it Godwin's law, in my mind, admits that you don't have an effective counter-argument.