Mass Murder is illusory. So is following the path of Buddha.Where I differ is on the grounds of common experience. And I think illusory is a horrible world. What about mass murder is illusory? Sure, the "mind" thinks it's murdering, and "minds" think they are witnessing others dying, but it's still mass murder.
Saying that "it's only mind" in no way relieves one of having to experience the causes and results of such actions. In our experience, it is not "somehow less real" if one understands the primacy of mind. Nor does the experience of the unfindability of existence obviate ethical discipline.