Wages, in a capitalist society, are decided by supply and demand. That's why KDB is on £300k a week, because you won't find a dozen KDBs standing in the dole queue.
We now have a labour shortage (caused largely by Brexit) plus raging inflation on a scale that anyone aged under about 50 has never known. In such circumstances, pressure for higher wages is inevitable. The Tories and their fans don't like it, but it's their system. They wrote the rule book. Going on strike is no different, in essence, to Tesco putting up a tin of peas by 20p. No one calls that 'holding the country to ransom' do they? Come to that, they haven't said it about the oil companies ripping us off with their ridiculous prices. No, that's OK, because they aren't workers, and have their dividends and directors' fees to consider.
Thatcher resolved an issue of high inflation and high demand for wage increases by creating a pool of three million unemployed. I doubt that trick can be repeated any time soon.