Either nothing is hashgacha pratis, everything is, or something in the middle. CMIIW but no source earlier than the bal shem tov holds such an extreme position as "everything". To each their own, but it's totally counter intuitive to me and doesn't sit well with me at all.
I never really known that there are opinions that disagree with the Ba'al Shemtov on this. Thank you for teaching me something. To me the Ba'al Shemtov's
shita is the only intuitive notion and without it... well, lets just say its the only way I can perceive Judaism and reality.
It is much more comforting (intuitive) to say the Holocaust happened by Hashgacha Protis, than without it. (As precedent, I would also point out how Hashem explicitly planned Galus Mizraim in the text)