Because there are conflicts of interest. Factory workers create the products which create profits. I am paid with these profits, if the profits go down engineers loose their jobs.
If Factory workers longer and more efficiently my job becomes more secure. So obviously I want a union which advocates that factory workers work longer hours, it is clearly in my interest. The same goes for strikes, if factory workers strike they endanger my job and reduce the size of the engineering department, reducing my chances to get promoted.
Their unions want my job to get outsourced and my working conditions to be made worse (RTO) why should I have the tiniest shred of solidarity with them?
>Get rid of them and there'll be plenty of money for both of you.
The unions? Sure, if they were gone things would become better.
If Factory workers longer and more efficiently my job becomes more secure. So obviously I want a union which advocates that factory workers work longer hours, it is clearly in my interest. The same goes for strikes, if factory workers strike they endanger my job and reduce the size of the engineering department, reducing my chances to get promoted.