Mandates were an unfortunately necessary means to an end. I talked to one MAGA colleague who said Biden's civil service mandate was what got him to get the jab. N=1, but I'm sure the mandates helped convince many to do it.
I've mentioned my cousin before, but her specialty is vaccine communication (she's probably not a fan of my bombastic nature of going about this, fwiw). Anyways, she was interviewed in NYT and Wapo late 2020 and was sounding the alarm here that there wasn't enough being done to combat misinformation. The mere fact that this topic is doctoral level at an Ivy shows how difficult the problem is.