They haven't taken anyone. They bought Rooney and they might be buying Lukaku.
One was a world record fee the other will be very close. Nobody was buzzing about selling him but some are happy to have him back.
We will get significantly more than the 60 million Barca reported paid (or the 70 million they lied about recieving) for the best striker in the world. This is for a lad they regard is inferior to Origi and Firmino. So fans feel we are getting a decent deal for a lad who won't sign a contract.
That's the nuance of the debate, of course it's obscured through the knuckle head Donald trump world of kopitism and alternative facts.
As a final aside maybe someone should remind him they let their star striker Michael Owen leave. Thankfully he joined a bigger club and would go on to win the league (had Gerrard also left think of the league medals he'd have, as opposed to having to borrow Owens or Rooneys to shine every now and then). He's now a club ambassador not just a regular player for Liverpool. A club ambassador, a fine reward for winning Manchester United league titles.
Let that sink in before you take their infantile jibes seriously.