Pretty sure phasers have some type of aim bot built into them. The angle they deflect coming off the emitter changes and they never hit hostages.

(Given stun setting…. Being as reliable as it is… I never understood that. Stun everyone and call it good. Details.) (lost opportunity for Garak and Bashir, though. “You shot me!” - “You’re welcome.” - “my good doctor, don’t tell me you didn’t enjoy it”)