It seems to be very much a cultural thing. Many countries find it unnecessary to either establish *or deny *a “right” to bear arms as an individual liberty – heck, in the US itself it was still being argued if this meant an *individual *right relatively recently.
But that’s where the cultural part comes in: the US version, paraphrased, says “because we may need you for a militia, your right to be armed will not be infringed.” It presupposes a populace that already expects to have the right to arm themselves.
One sees that in the Mexican version it explicitly recognizes the right to be armed for your own safety and protection, something that the US version does NOT include in the text and was still being argued in court centuries later. Yet, in virtually the same breath it immediately states that said right is conditioned on that you may only be armed in such a manner, time and place as the Law allows.
But come to think of it, that’s what ALSO happens in the USA – the right to keep and bear arms is NOT unrestricted and unlimited: the states and the Federal government variously regulate types of weapons, sales of weapons, where and how you may carry, who may carry, etc., court decisions have said that the regulation may not become a total ban, but it’s OK to regulate.
And that’s what happens in many of the world’s cultures: it is just plain and simply considered a “given” that how well armed is the citizenry, if at all, is a matter of policy, not an inherent “right” as would be free speech or religion or a fair trial. To many of them it’s so obvious it does not have to be written – even if there is a tradition of gun ownership, for instance in rural areas, surely the Law will make the necessary reasonable adjustments, they’ll tell you. And it seems that to the American founders, too, it was so obvious, that it HAD to be written that it could not go all the way to total disarmament of civilians.
BTW - a curiosity: Not a right to bear arms, per se, but the current French constitution incorporates “by reference” the Bills of Rights of the 1946 constitution and of the Declaration of the Rights of Man (according to this article, validated by a decision in 1971 to be just as binding as if it were the current text), which includes as one of the fundamental rights those of “security” and “resistance to oppression”.