This is an adversarial process. Unions exist to fight employers. Unions spend about 23 billion a year in total. Only spending 1.5B to defend against 23B looks like a bargain.
A way to exit the adversarial process is by ending the separation between owners and workers, through things like worker cooperatives, employee ownership, and workplace democracy.
AFAIK The USA is one of the most anti-union non-authoritarian countries for a very long time. In other countries people receive a lot more support and protections for the right to organize
Unions often exert more power at the state and local level. In certain states, they can consistently wield a lot of power.
Unions in the US tend to be much more aggressive than they are in other places, which has in part led to their decline. Americans historically have tended to hate unions at the times when they’re powerful, and love them at times when they’re weak. In other words, people like the idea of unions in theory, but hate them in practice.
It that’s true, why is union membership declining? why did Trump et al gut the NLRB? why do starbucks unionized employees STILL not have a contract years after forming a union?