Neither. It neither changes safety nor moves targets. It is worse -- a distraction that leads away from solving the underlying problem in the same way as the Gun Control/Knife Control issue obscures and redirects passions.

Machines and locations of queues are not to blame. The real problem is (multi)cultural -- hate in people's hearts and evil plus incompatibility of cultures & religions. That is the root of the problem and moving a queue to a new location on the sidewalk won't solve it.

We are distracted and quibbling about irrelevant details. I refuse to accept the premise. Cutting to the root of the issue as best I can, civilizations must determine whether to abandon multiculturalism and insist on a homogeneous culture or continue down the current path.