Richard, are you saying you'd like to see more focus on the "darker" side of history, those things that are often suppressed or not talked about? Countries that were colonised like my country Australia, have both an "official" view of history, in which everything the colonists and the invading nation did was good and wonderful, and the stories of the abuses, exploitations,massacres,rapes, enslavement and other awful consequences suffered by the original inhabitants, who are still suffering today. You can come under attack pretty quickly in Australia for telling any of these stories, no matter how true. Yet they are just as deserving of appearing on WikiTree as the British-appointed Governors, the politicians, the church leaders,the sportsmen and so on who are the "official" stars of history.
I imagine the same applies in other countries that have their "skeletons in the cupboard" - dastardly regimes, slavery, witch trials, pogroms.I share your interest in finding out who these forgotten people are. Their stories are generally much more interesting and edifying. I think you're probably right that those who find themselves "forgotten people" today would be glad to see their history told and more likely to join up and contribute if they could see that the bald truth was being recorded here.
I'd suggest, if you want to see a page on Wikitree about certain witch trials, that you go ahead and create a Free Space Profile on that topic, with links to profiles of people involved. You don't need anyone's permission to do that. When you've done it, put a notice here on G2G with a link to the Free Space and that will attract the attention of others who are interested in that topic, who may have more to add.
As an example of what I mean, here's a page I did about a shipwreck https://www.wikitree.com/wiki/Space:The%20Wreck%20of%20the%20Osmanli