The fact that he also killed his own countrymen in a serial killing spree proves that this individual was not targeting Jews but groups of people he felt were involved with oppressing other ethnic groups. Secondly, while I did not call the act "unacceptable" I did say that it was incorrect, especially regarding the young victims. Calm down and you might just be able to contribute something with a bit of rationale...
Yemeni ISIS affiliate claims responsibility for Sanaa mosque bombing (Reuters)
from the article: Live Coverage: French police surround suspect in Jewish school shooting