Clearly, it never occurred to Thoreau that some music probably shouldn't be stepped to.
If John Wayne Gacy does not keep pace with his companions, perhaps it is because he hears a different drummer. By all means, do not let him step to the music which he hears!
It seems to me that tolerance means being open to the possibility that not all differences between people are born of evil, and that what I think is true may not be true, and that what someone else believes might hold new wisdom for me as well.
But tolerance is only half of the solution. The other half is discrimination. After examining alternative ideas and beliefs with an open mind, welcoming the opportunity to set aside your prejudices and learning something new and good, it is time to discard anything bad, whether in your new thinking or your old.