“Lake, i suppose opposing tzedukim, karaim, shabsai tzvi, reform, conservative, zionism, and every other bad idea was against the Torahs lesson from korach?”
Again, if the ideology is indeed “against the Torah”, you would be correct. However, there has been no authority who has made such claim, so at this point it is “sinas chinam” to publicly deride the ideology or its adherents.