You are intentionally cutting out half of the text of the sentence, which explains why the right exists.
Of course I am ignoring the first half of the text, because it is irrelevant to our present discussion. It is unquestionably true that the Constitution protects the right to bear arms.
That it exists matters;
why it exists does not (at least in the context of this debate).
The first part of the Second Amendment is, in this respect, similar to the Preamble of the Constitution: it declares a purpose, but has no substantive effect.
Thus, we have established that the people have the right to "keep and bear Arms" (whatever the reason for that right may be). Clearly, the right to "keep and bear Arms" includes the right to determine how those arms are to be kept and borne. It is each individual's right to determine how he shall bear his arms. Thus, he may decide whether to bear them openly, or whether to conceal them: the government has no power to interpose.
I will also observe that the Kentucky Court of Appeals declared in
Bliss v. Commonwealth (1822) that a statute against concealed carry violated the right to bear arms. If I am not mistaken, the Supreme Courts of Tennessee and Mississippi also held this to be the case during the nineteenth century (but I do not recall the cases). I think that Indiana, on the other hand, maintained the contrary doctrine (
State v. Mitchell).