Well first, you can't spin that on her given she wasn't even conscious when it happened, she was possessed by an outside force.
And also, M-day certainly didn't destroy all of mutant culture, it crippled it at worse.
Unless you are suggesting that the depowered individuals who used to do art, style, litterature, music etc. gave up on absolutely all those activities ever since, and that every piece of culture they created EVER was destroyed, down to the very last one, by or because of M-Day.
Which I absolutely don't buy.
Calling it fool right now, that's the kind of over the top remark that have me wary of anti-Wanda speeches.