If they are merely fence sitters, or those that just have never desired to own a gun before, yes I agree. Many times some of those can be shown the way if you take the time to show them about guns, and teach them how to shoot, and how they have been lied to about guns, can be moved to our side. But true, dyed in the wool anti-gunners, I just would not waste my time, energy, or breath in trying to reach them, or teach them in the use of tools they can use against us.
It's a fair point you make, and a reasonable concern.
From my limited personal experience, I can't say I've ever seen anything which has led me to believe it's a risk. I have met some hard-core antis, and invited a couple of them to the range, and they simply declined.
But they did appreciate that I attempted to reach out to them, and we have become sorta friends? Friends that disagree on everything political, that's for darn sure, but the world is a better place when at least there's civilized disagreements as opposed to rabid hatred, and it's hard to hate someone who treated you with kindness and respect.
Also, as a shooter you know this as well as I do: shooting is a perishable skill. If they want to use those weapons against us, they're going to have to buy them, and shoot them, and dry fire with them, and clean them, and go to brownells and get replacement springs, and watch YT videos on how to install the springs, and suffer ammo prices like the rest of us, and vote against anti-gun laws, because if anti-gun laws get passed, then the next generation of [whatever we're calling them] can't get guns, same as us.
So I'm reluctant to believe that a lot of people who walk the same road as us will end up so very different from us. Sure, there's always some fringe weirdos, but if the majority of us and them have all this in common, then we're a lot less likely to want to kill each other.
As for training them in the use of tools they can use against me, there are far superior teachers offering tons of content on YouTube that will show them everything they need to know and then some. IOW, my teaching them or not isn't going to make a bit of difference if they're really out to kill me, but being a good person, offering to teach them, speaking to them with respect, well, that might just make them reluctant to kill people like me, because they will discover that we're pretty decent folk!