Why? Did the Bucks ever made an offer to Bron or Kawhi and they refused?
Of course not. The Bucks weren't a consideration for either of them. They were like when a coach says he's "withdrawing his name from consideration" for a job everyone knew he wasn't getting anyway.
Buddy the Bucks aren't interested in any of these fellas...
Then the Bucks are incredibly stupid.
Kawhi and Lebron are top 5 players in the NBA and you're trying to make the argument that the Bucks wouldn't want them. Hilarious.
If either of them expressed any interest in the Bucks, they would have done everything in their power to get them. Especially a player like Lebron who would be making sure that Giannis was getting fed the ball all game every game, just like he's doing with AD.
Meanwhile, the Bucks didn't get a single FA of note (despite your claim that everyone wants to play there) and had to pay a lot more to keep Middleton than the "team friendly deal" you said he'd sign for.