Sure, and I didn't claim that Czechia is the same as US in this regard. I'm merely pointing out that you
can have a country with a gun culture that, among other things, enables personal self-defense without all the associated problems that US has which people often assume are
intrinsic to gun ownership and defensive use.
I disagree that the situation in US has nothing to do with healthcare and social safety net, though. For example, suicides constitute most gun deaths in general, but this is worse in US because of its generally poor situation with preventative health care, especially mental health care. Similarly, poor social safety net means a lot more people ending up in poverty, which drives up crime including violent gang clashes that cause the majority of gun-related deaths in US. This isn't to say that the prevailing attitudes among American gun owners do not contribute to the problem, either - but I'm sure that, if US would catch up with e.g. Canada when it comes to taking care of its own population, the numbers would strongly reflect that.
And yes, it is ironic and sad that support for RKBA is strongest on the right, which is also the cause for all this. It's not exclusively them, though. The running joke on the subject in many hard left spaces is that "if you go far enough left, you get your gun rights back".