Well you just devastated modern day Salem's economy! Halloween up there is like Thanksgiving in Plymouth, and Patriots Day in Lexington and Concord all rolled into one.
You can't shake a broomstick without hitting a Witch or at least someone that knows one in Lovecraft's Arkham.
The lines of tourists on tours are like when a buffalo herd blocked a pioneer and the closer you get to October the bigger and more plentiful these things become.
Yes Salem has plenty of other points of interest but the Witches put them over the top.
If someone were to build a time Machine to go back and stop the Witch trials the Salem Chamber of Commerce would build one to go back and stop them.
The Police have witches on broomsticks painted on the doors of their cruisers.
Of course, no one cares to mention that its the people who refused to admit to being witches and not the ones that confessed that were killed but why muddy up the ideal?