Each airline deciding this individually isn't really the right way to do this, though. Airlines may have incentives to be more tolerant of risk than passengers are comfortable with (similar to other safety measures). When buying a plane ticket, I shouldn't have to make my own assessment of the safety of flight plans or mechanical maintenance.
There should be an independent agency responsible for setting standards and compliance. Thankfully, there is. The FAA and EASA (EU equivalent) are responsible for issuing notices about which flight plan routes are safe and which aren't. Neither declared this airspace unsafe.