There is always a temptation on here for people to simplify things too much.
This dispute is very complicated and there have been faults on BOTH sides.
There are many many different reasons why the vote went the way it did.
Here are a few:-
Some crew don't trust BA to be fair in the future with route allocation.
Some crew have read the agreement are ARE happy with it and do trust BA.
Some have not even read it but have relied on misinformation from Bassa.
Some are happy with the agreement but upset about losing staff travel.
Some are unhappy about the suspensions and sackings.
Some have been persuaded by the union that they will be redeployed if they sign the agreement.
Some are just putting their heads in the sand and hoping it will just go away because they can't cope with all this anymore.
You only have to read what DH said to those crew he wants to leave the union to understand why they are all confused.
As I said the only thing that is certain is that both sides have handled it wrongly at times and that this strike will have hardly any impact on BA because in the end the majority of crew will come to work.