Sure but even the supreme court disagrees with the supreme court. Treating their rulings as the best or canonical interpretation of a case doesn't make much sense.
It's not like any interpretation is valid but there are plenty of valid ones.
By definition, the Supreme Court's decision _is_ the canonical interpretation. Whether you disagree with the decision has no bearing on the matter.
And of course it makes sense, because the legal system was created by the very laws it upholds. If you think it should be different, then you'll have to convince a lot of people to change a lot of laws and probably parts of the US constitution
> Treating their rulings as the best or canonical interpretation of a case doesn't make much sense.
It does, because the Supreme Court's ruling is the legally binding interpretation.
The EFF are just some people with an non-legally binding opinions.