That is much rare then you think. Row v Wade has survived many conservative courts. There second amendment case going back hundreds of year. The court don't change that lightly. Also if you read the Heller decision the logi is bit hard to overcome.
If the courts acted as you suggest the rest of government would be irrelevant.
The
Heller decision was 5 to 4. If Scalia had died before that case was heard, and Obama had been able to appoint Merrick Garland to the Court, it would have gone the other way. As for "the logic being hard to overcome", I'm sure you feel that way, but I know of at least four people who feel differently, and they all currently sit on the US Supreme Court.
Also, I'm not sure what you mean when you say the "second amendment
case goes back hundreds of years". Which case? Somewhat surprisingly, there really isn't a lot of Second Amendment case law from the Supreme Court. The last major decision before
Heller was
U.S. v. Miller (1939), in which the Court did find that a particular type of gun could be banned, holding:
"In the absence of any evidence tending to show that possession or use of a "shotgun having a barrel of less than eighteen inches in length" at this time
has some reasonable relationship to the preservation or efficiency of a well regulated militia, we cannot say that the Second Amendment guarantees the right to keep and bear such an instrument. Certainly it is not within judicial notice that this weapon is any part of the ordinary military equipment, or that its use could contribute to the common defense." (Emphasis added).
The
Miller decision was the norm, until Scalia got his 5-4 majority, and put a bullet through reasonable gun control measures, if you'll pardon the pun.
"If the courts acted as you suggest the rest of government would be irrelevant."
??? I'm not sure what you mean by this. Courts reverse earlier courts all the time. Moreover, Congress can get around a Supreme Court decision by simply passing a different law. Of course, the new needs to be constitutional.