Bed made.... lie in it?

Can some help me with my confusion on something. I understand that British Airways cabin crew are planning to strike again, and this time it is because of the loss of travel perks that those who went on strike last time had removed.

What confuses me is this. When they went on strike last time they were told, in no uncertain terms, that if they did they'd loose the perks of free travel, cheap flights etc, so why exactly do they think they've the right to have the perks back?

They were told what would happen, they knew what would happen. I believe the phrase you made your bed now lie in it, should be the correct one here shouldn't it?