My biggest problem with the viewpoint that blames the current Israeli fire on Sabbath desecration is that one should only look for supernatural explanations, when no logical natural explanation, exists that can easily explain the tragedy.
In this case, when we have evil Gentiles in the land of Israel, who the Torah commands us to expel and they are actively involved in arson and terrorism on a continuing basis while the government of Israel including Rabbi Ovadia Yosef usually ignores this biblical commandment; it is no wonder, that from time to time, these evil Gentiles will succeed in causing great damage.
And I should add that not only Gentiles who actively commit terror are considered evil, but also those that are merely happy about the Terror that others commit against Jews, or support theft, idol worship, immorality, attacks against Judaism etc.