Depends on which investigation one chooses to believe the one presided over by Modi shill or multiple independent ones that gave forensic evidence that the fire started inside and was likely an accident. https://en.wikipedia.org/wiki/Godhra_train_burning#Banerjee_...

Is your argument that collective punishment on the basis of religion is reasonable?

I'm sure I can find some atrocity attributable to religion X too. Should everyone from religion X be punished?