That seems like a very minor connection to nationalism. Also, lots of other political ideologies put a similar amount of faith in their government. I don't see a reason to single out nationalism at all beyond maybe pushing your agenda. The real lesson to be learned from this is not that nationalism is bad but that people should not trust their governments.

Who cares what the precise political ideology is? It's the same human characteristic.

You, apparently, because you specifically pointed out nationalism and even gave a justification as to why.