Exactly! I always bring this up whenever someone starts babbling about "well regulated militia". The plain fact is that it doesn't really matter what the 2nd Amendment says.
Naturally, when confronted by this the gun-grabbers tend to fall back on the Magical Super-elastic interpretation of the Interstate Commerce Clause, at which point I say "...oh, so according to you the federal government DOES have the authority to regulate...abortions...right?"
To which they're naturally going to be inclined to respond "Oh, so we've found the area where you actually believe in federal power!", but that's not true, because the feds didn't really regulate abortion pre-Roe. It was at Roe that they became more involved by throwing out state laws. Besides, it's not analogous anyway, one case involves when it's legal to kill other people, the others do not.