Fear can be a motivator for some. "The unvaccinated are afraid" is certainly a narrative that they are pushing. Maybe some people abstain solely because of fear. In other cases people might engage in sober-minded risk analysis and come to the conclusion that abstaining from the jab has the least long-term consequence probability at the small cost of the short-term social discomfort from mandates. This calculation would be premised on a number of factors including age, comorbidities, lifestyle, and estimated long term potentials for cancers or compromised immunity from poor care or quality control in the vaccines and their development. Some may see the equation as "do you want to be uncomfortable for the near future? Or do you want the comforts but gamble your longterm health?"
It's not always a case of fear. But the more these mandates are pushed into the territory of "no jab no pay", the more the risk analysis shifts in favour of partaking. I'm not sure how many people can coast with no income when the wellbeing of their family relies on it. They know that, it's why the issue is being pushed in the coercive manner it is. You never saw these types mandates for smoking or obesity. Why now? Why this issue in particular?