Where are you getting these 'facts' about how people are going to behave from?
Truly, if it changes one person's mind then it's done some good. This alone won't change anything but spreading this to allow people to see there are kinks in the armour will allow people to perhaps vote in the future for difference.
When the majority is against something, sometimes some good can be done. Not always. The government is all powerful, but there is a chance.