Other than that, playing nice could easily just result in Shepard aimlessly wandering the port, hoping to find someone more cooperative. Ain't nobody got time for that.
That's quite often true. Both in fiction and real life.
How many times has a story presented a scenario of the protagonist trying to infiltrate some building? He looks around. Lo and behold, he always figures out a way. There's always a weakness to be exploited.
How many times has a protagonist been running to escape some a disaster of some kind - a fire, an explosion, a collapsing building, and lo and behold, he always figures out a way. There's always something he uses to his advantage.
So this is a rather silly complaint.
You should learn a bit about Narrative Causality. Then perhaps you'd have a better understanding of these situations.