Why did Mcfarlane declare a war on his employees publicly

There was really no reason whatsoever to take his fight with the union into the public domain. After all both Trimet and ATU had agreed to a binding arbitration methodology. These sorts of disputes become public when there is a threat of a strike.

 So why did he do it?

Why did Mcfarlane declare war on his workforce from al m on Vimeo.