Well let me ask you this, where do you think we should draw the line? The 2A is quite cut and dry, "the right of the people to keep and bear arms, shall not be infringed." Also, are we willing and able to use the 2A for what its meant to be used for as a last resort? If not then that defeats the purpose of the 2A.
And I don't blame the second amendment crowd for our rights being eroded, I blame them for ALLOWING our rights to be eroded.
Same as we do with the first. Read up on strict scrutiny and second amendment. Some say the standard of reviews are still unsettled for the second amendment, but for now this appears to be the what the lower and appellate courts are going with.