Given that there are already lots of people seeking to stop atrocities, the presence of one more person trying to do the same seems likely to be irrelevant. But there are *very* few people who have even a chance to speak with atrocity-planners and possibly persuade them to do otherwise - effectively none.

Trying to decide what to do without looking at what most other people are likely to do is impossible. Taking the behavior of others into account, it is quite reasonable for one person to put another strategy into play.

If talking has even a small chance of working, the utility of applying it as well as other prevention strategies is greater than the others alone.