A union can get a monopoly over a certain employer, such that all hires are required to join the union or they don't get the job. Union dues can be half the annual salary with no benefit to the union member unless they remain a member for 10-20 years. Though this practice is technically illegal, it goes on without any Labor Department intervention. Why would you want to give up half your salary for no benefit until you've been working for years?
Come on, is that really the honest truth? What occupation or union has union dues at 50% of salary?
In the US, UAW's dues max out around ~1.5% of salary (or an hourly approximate equivalent), the teachers union maxes out at 1.6% of salary (highest possible dues cap out at $55/month max), the nursing union dues cap out at $65/month, our local teamsters are approximately ~1.45% of salary ($50/month for someone at a $20/hr job), and so on.
The "expensive Union Dues" mess is almost always FUD or outright lies. Union dues are usually pretty modest.
Ok, I understand that this is presumably an experience you had in your life once, but like, could you simply not hold a bad opinion against all labour rights forever, just because one person told you an (pretty obvious) blatant lie one time?
[1] https://freebeacon.com/issues/report-union-presidents-paid-c...