This case was decided 7-2, so clearly it wasn't just Scalia. Generally speaking, when decisions are supermajority, it's because that's what the law and precedent really say. And the precedent that law enforcement doesn't have a "duty to protect" long predates this case, so it's not really surprising.
In general, it's worth keeping in mind that the point of courts is not to decide whether the outcome of the case is ethically or socially desirable. They're there to look at the laws and precedent and figure out how it applies to a given case. If the result is undesirable, it's something for the legislature to fix.
In general, it's worth keeping in mind that the point of courts is not to decide whether the outcome of the case is ethically or socially desirable. They're there to look at the laws and precedent and figure out how it applies to a given case. If the result is undesirable, it's something for the legislature to fix.