You seem to be unfamiliar with the absolute basics of cartels, collusion and antitrust law.
https://en.m.wikipedia.org/wiki/High-Tech_Employee_Antitrust...
https://en.m.wikipedia.org/wiki/High-Tech_Employee_Antitrust...
Because that's nor a market, that mafia rule.
If you consider improving someone's quality of life by offering better salary to be 'like murder', and do not recognise that cartels, illegal in every civilised nation, are bad for the economy, then I cannot fathom what I could possibly write to get through to you
And as mentioned before, workers cartels (unions) seem to be legal in most "civilized" places.
Or think about another example: poaching somebodies wife. That also seems to be frowned upon in many places. Yet, it is just an agreement that nobody should make somebody else's wife a better offer.
People tend to forget with all those rules that they could also be on the receiving end of things. You may not be a worker forever, maybe one of these days you want to become independent and run your own company. It would be a shame if people effectively weren't allowed to do so anymore.