No this is right. If left-, right-politics have taught me anything, it is that your personal business, emails, and bedroom behavior are the concern of the federal government and its electorate--at least the 50% that agree with it.
Hoover was running his little fiefdom with minimal oversight under both Democratic and Republican administrations. Both sides used him, and doubtless both sides feared the dirt he had on them and what he might reveal if called to account by Congress.
Kompromat might be a foreign word, but it's hardly a foreign concept.