If there was a thread about a mass shooting in the US, and a non-American asked something like "people in the US are allowed to own assault rifles?!?" and someone answered with the literal text of the 2th amendment and no other explanation, would you think that's a good comment?
Yes, I think it is a good comment because it answers the question exactly to the point. However, if there is an implied question as to 'why' people should be able to own arms, then of course it's better to elaborate further.