i've never heard of Wiccan's saying that. most i know use it as an example to shake there fist as them no good bible thumpin' types. [a joke] i personally always liked Giles Corey, that guy was brilliant!
Salem is the most notorious of the witch hunts, but i don't know why because there was tens of thousands killed over the span of 300 years. someone i watch online once described Salem as 'Disneyland for Pagans' and it is. i've always wanted to go and soak in the history, but it's full of occult shops apparently, and there are haunted tours, and seances, and tarot readings, and all sorts of stuff apparently.
why Wiccans probably don't feel a strong kinship with the Salem Witches is because they weren't [except for maybe Tituba] real witches. the girls did something they shouldn't and instead of fessing up, they claimed witches made them do it. from there it was accusations of every wealth owner anyone had a grudge on or plain didn't like. it wasn't until 1693 when the courts finally stepped in and put an end to it. so that could be why some Wiccans consider them martyrs, because they were dying for god. this is how the trials worked. they asked you 'are you a witch' you say yes you've confessed and you're going to hell, you say no, you're lying and are then beaten into confessing. [which they never did 'confess' because it's a sin to lie, and they'd go to hell.] Giles was the only one who said nothing, so his land was intact for his family to inherit and he could die a christian.