Find/make friends that you can approach content with together and you will not have this problem.
Just because the Duty finder is there, does not mean you have to use it..... The Duty Finder is an aid for people that do not have a large circle of friends, a large FC, a static group, or maybe you just have 2 buddies and would rather pick up a random than spamming Mor Dhona for the 4th member to launch as a pre made...
The point is this. You really do not know the mindset of the people you will be playing with in a duty finder party. No member in the DF group has any deep rooted responsibility to the party itself, and more importantly, since the DF is cross server, there really is no consequences for selfish play, since you will probably never see these players ever again. You should approach the DF as if you were playing solo.... the reason why you queue for DF is because you do not have a group of friends to do it with, or not a complete group.
Instead of acting to punish those that chose to give up on the group that is inevitably going to fail..... i encourage you to FIND & MAKE FRIENDS!!