You won't convince them by soothing their fears with appeasement and soft-selling 2A as you are (and as the NRA tried to do for decades). It is a war of attrition that you will lose every time. You give an inch, they take a mile.
There are just a few things that actually work:
1. Unfortunately experiencing violent crime first hand (as a victim, I wouldn't wish this on anyone).
2. Put a gun in their hand and let them shoot.
3. Put them in a "peer group" of former antis. They like falling in line with peers. I say this somewhat sarcastically, but it is quite true. When they see someone they can identify with outside guns accepting the varying unpleasantness of guns, revolution, violence, etc... They come around really quickly.
The facts are on our side. History is on our side. So, you just have to break the bubble they have been living in and it opens the damn of firearms ignorance.
You won't get the same turn around just trying to soft pedal the realities of self defense and tyranny. Again, see NRA. Give it up.
So where does your method of screaming about overthrowing the goverment fall into those choises? Oh thats right, it doesnt. I am not 'soft selling' I am just trying to give them a chance to study the facts, as opposed to trying to scare them into agreeing with you... and we all know how well fear works to convice someone that you are right...