Trade unions were not created to represent the masses, however some of them took this up, with varying levels of success depending on the inherent conflicts of their trade versus the needs of the masses, as a side job. They are supposed to represent the workers in a particular trade for pay and working conditions. Often what the masses would prefer is just less work to do and that is not in a trade unions interest to really help with. I have had discussions about increasing productivity in UK factories by integrating CNC processes so that you can have more machines per operator. I was told flat that it was a non-starter as it was one machine per operator and if I did anything different I would be opposed at every turn.
I suspect trade unions are most concerned with the short to medium term interests of their current members. And less so with the interest of the greater public.
In this case they likely want a pay check for their members.
This is just my opinion and I’m completely speculating.