It's not convenience, it's that the ONLY reasonably priced flights are non-refundable ones, and not everyone can afford another flight ticket just to prove a point. Another idiotic thing that we need to change.
Although I really do wish there were an "Airbus only" option when booking flight tickets. And as much as I don't normally like to stereotype things, when it comes to safety I feel I've consistently seen much better safety standards in EU than the USA. Safety seems more drilled into the European culture. I just somehow have this gut feeling that some random dude at Airbus crimping some wire probably actually did everything correctly and to specifications.
Not to mention they have stricter work hour limits in Europe, so I don't have to worry about someone doing a shoddy job due to lack of sleep.