We live in a time where having "incorrect" thoughts can have very severe consequences. Pollsters and survey conductors are going to have to get used to an ever increasingly number of people lying to them because they don't want to risk some offended mob coming after them for wrongthink. In the US, when it came to vaccines, there was one, and only one, acceptable thought: inject me as soon as possible. All other thoughts were verboten and most views that stray too far from that line still are unacceptable. Given the potential consequences, pollsters claiming answers will be held in strict confidence aren't going to make much headway against the cultural norms that offer personal destruction. It also doesn't help that many of these surveys are either conducted or sponsored by entities with strong political affinities.