Forming a union is one thing. Actually agreeing what to demand and getting it is another. That seems to be where these things break down. I watched the Amazon union go from popular and "more money, less crazy metrics, more toilet breaks" to "end racism in Amercia" and then no one wanted to risk their jobs to ask for the impossible...
If you mean in AL there was a lot wrong there including massive union busting efforts and a lack of worker education on what unions are, but people who want a union really should choose their union leadership carefully and be ready to replace them if they feel they aren't being represented.