The Latin American states where the elites lives on hill-side housing, protected by guards and fences, all have fairly strict gun laws. They aren't going to let the poor arm themselves! While European gun laws are usually stricter than those in the "red states" of US, there are many places that have more lax laws than New York, Connecticut, and California (Czech Republic and Italy two examples that popped to my head; New Zealand and some Canadian provinces -- while not in Europe -- are also more lax than NY/CT/CA/MD afaik).
The reason you have the firepower is because those left behind by the knowledge work revolution and living in the inland US still have sufficient political power to counter the Manhattanites and San Franciscans eager to take that firepower away ("oh no, we can't let the peons be seen carrying their icky icky AR-15s, ewww!").
The biggest pusher of gun control in the United States is Mike Bloomberg -- he also happens to be a fairly enthusiastic defender of Wall Street. In his mind it makes perfect sense: why would the elites arm themselves directly, if they can just isolate themselves in Manhattan and Pacific Heights, protected by an armed police state. His gun control support (which seems to be back firing so far) is a great way for him to score brownie points many liberals (who would otherwise be diametrically opposed to most of his positions) without actually proposing any laws that would inconvenience the top 1-0.1% of the population.
I'd imagine the Swiss voters (who are voting for this) are laughing extra hard; upon completion of their militia service, they're able buy their service rifle (SIG 552) for $35 (the cost of converting it to a semi-automatic) -- the US-export equivalent (SIG 556) costs in excess of $1800 and cannot be purchased by those in New York or CT (and without significant alterations, in California), the states where quasi-technocratic elites dominate politics: they "know" what's best for the lowest classes (hence support of paternalistic programs like SNAP as well as individual mandates like social security and ACA), they also "know" what's the best for you to defend yourself.