Really? The majority of Americans are pro-union and a solid majority sees their decline as a bad thing.
Membership is definitely tanking.[2]
[1] https://news.gallup.com/poll/12751/labor-unions.aspx
[2] https://www.bls.gov/opub/ted/2019/union-membership-rate-10-p...
~40% want to see grow to ~30%, giving them ~57% share of people with an opinion.
The confidence stat is silly - I don't have a huge amount of confidence in unions either because of their obvious decline in the last few decades.
Don't really see how you can see the [1] poll and not think that there is clearly a fair bit of support for unions. [2] seems completely irrelevant to popular opinion, which is what we were discussing.