Or their union sucks.

My wife's union before she went into management had let health care fees go up faster than raises for almost a decade, all while raises were often less than the rate of inflation.

The guy they would send to do negotiations had no idea of what he was doing. Things would sneak into the contract that were against the interest of employees which only a lawyer would understand.

Grievance would see little follow through.

My wife's branch of the Teamsters had a lot of soft corruption. The union collectes dues, union representatives collect paychecks and the workers got little from it. The only reason her shop is unionized is because Democrats generally won't buy printing from a non union shop, so the company let's one in ten shops be union shops as long as they don't demand much at negotiating time.

If the union gets uppity they close the shop down.

The solution would be to unionize the across the whole network of print shops but I guess the Teamsters don't organize anymore.

It's a fucking mess.

Why would the average employee be pro union if this is what it gets them?