I'm with Voltaire on this (no doubt he's really pleased about that) - "To the living we owe respect: to the dead we owe only truth."
My ancestors seem to have been either pillars of virtue or good at covering up, which is rather boring, but my wife is convinced I relish the teenage pregnancies, toyboys, suicide and syphilis in her family in Victorian times. She's right.
On the other hand my ancestors can be traced in several lines back to Norwich at least as far as Elizabeth I. That is about halfway back to the affair of St William of Norwich, when the good citizens kicked off the rumours which developed into the Blood Libel. Chances are reasonable that I've got that in the tree somewhere.
Another, rough, quote: Felipe Armanez-Ernesto said something like "the only reasonable response for anyone to the history of their country, whatever the country, is shame"