Two points.

If you don't like the rules in a unionized workplace, don't take work there. If you sign on, then follow the rules while working within the union to change the rule you don't like.

One Ontario community has 22 full-time firefighters and 250 volunteers. Surely you can see the concern that any union would have. Would you feel secure working in a job where there's just 22 full-time employees, along with 250 part-timers willing to do it for almost nothing?