Most people in the industry are only too aware of what the impact of strikes is. That is why all but state airlines (and ex-state airlines like BA) do everything in their power to sort out industrial issues.
A strike is meant to hurt - it also hurts the striker! - it is not meant to be convenient. It represents the last resort of people who are seriously frustrated. Can you not imagine being in the sort of job where you simply can't get through to your seniors any other way? If so, you must be very lucky.
For what it's worth, if bmi would work, then I'd suggest you go with them. They have never gone on strike before.