Waterrock,

About 9:73-74, "strive hard against."

I've seen interpretations that, instead of referring to physical fighting (which seems most obvious, given the context), it is referring to verbal (or some other kind of social or punitive-but-non-violent) opposition. I have not seen anyone claim this means "internal struggle." These verse refer to Muslims striving hard against other people, not to wrangling with their own personal psychological tendencies toward disbelief/hypocrisy.