[novas0x2a]

First, let me say that I'm not panicking about the probability of this actually happening, but: "I'm more likely to get killed by a fall in the tub than by a terrorist" is only true of an _arbitrary_ attack at an _arbitrary_ venue and time (and an _arbitrary_ bathtub :)). Events that use Yondr announce it ahead of time, waving a big flag that says "no one here will be able to call for help." The probability of an attack at such an event would be much higher compared to an arbitrary one (although, definitely still small, which is why I'm not exactly panicking...)

[valuearb]

Your entire premise is incorrect. Even with Yondr hundreds of people will be able to call for help. Such as ushers, security, ticket takers, concession workers, event management, etc, etc, etc.

Yondr means less (or at least less rapid) social media publicity for a terrorist act, so one could argue that it deters terrorists.