FWIW, why aren't the pro-gun control people against people driving cars? That has a much higher death and injury rate. (This isn't a serious challenge, it's an example showing that the normal arguments rest on axioms and postulates that aren't explicitly stated.)
These folks and anti vaxxers and anti gun control and pro driving ever larger murder SUVs are the dumbest motherfuckers alive.
Fine.
These folks and anti vaxxers are the dumbest motherfuckers alive.
These folks and anti vaxxers and anti gun control are the dumbest motherfuckers alive.
You don't need first hand knowledge. You need to trust the experts whom you charge with helping you make informed decisions.
I'll see your experts and raise you my experts. Which experts do you trust implicitly? Maybe the experts in the oil companies who knew about climate change and didn't inform us? Maybe the doctors who promoted smoking back in the day? The doctors who prescribe opioids for minor pain despite the epidemic of opioid abuse? What about Bayer which says Roundup doesn't cause cancer, despite two current cases where the jury found that it does? Perhaps the experts that said Sadam had WOMD resulting in a war we are still feeling the effects of today. Your informed decisions are only informed if you have all the information. I try to avoid letting "experts" make my decisions for me unless I'm confident in their expertise.
"It's what you learn after you know it all that counts." -- John Wooden