To misquote Bryan Cantrill, one should not make the mistake of anthropomorphizing Netanyahu.
When a nationalist politician like him is faced with an event like this, long-term international diplomacy considerations barely enter the picture.
The violence just comforted him in his previous worldviews, all he saw was that his nationalistic policies were justified and the only viable answer was to be even more of a nationalist.
I don't see any reality where he didn't have the most violent response he could get away with.