This seems like a dodge to absolve Mormonism.
It could be that "active" Mormons aren't the ones getting drunk and spewing racism in this particular case (though we don't know for sure, of course). But there's little doubt that the history of Mormon racist attitudes contributes to what many people (whether they're active Mormons, non-active Mormons, non-Mormons or whatnot) feel is acceptable racially within the state. There's decades of attitudes built up there. These change slowly, unfortunately (faster among some than others, of course). It's not something where a switch was just flipped within Mormonism and now the history of these racist feelings and attitudes don't matter anymore. That's not how culture works.
To my mind, and as LDS myself, Mormons should try to be at the forefront of anti-racist efforts in the state, since a significant (not the only, of course) element of Utah racism derives from the church's historical influence, an influence that helped lead people in Utah to think not only that racist attitudes are OK (or at least can be overlooked) but also that this racism is part of "who we are." So to me, it's our problem to a significant extent. We need to own it and do what we can to rid our local community of it.