I used to be the senior union rep at a former 'blue chip' employer. No union takes staff out on strike without very good reasons. Most of the work though, isn't about money but H&S standards and supporting workers against poor managers. As a union rep I was also constantly fighting to make the company better - it's the best way of keeping jobs, and gaining pay rises for all.
As for the video, this is true of many industries, water, gas, electric to name but a few. In theory by selling off our assets we get investment from abroad, but as services are just constantly getting worse in the name of making profits for shareholders, this is obviously a failed idea.