They don't deserve to win. They got handed a great team on a silver platter. They should have to pay their dues before they win.
That's just not true. By no means were they destined to be a contender from the start of their franchise.
They weaponized their cap space masterfully by taking on bad contracts in expansion, made other GMs look foolish in trades by identifying undervalued talent and struck gold on most of the picks they did make.
You also are neglecting all the acquisitions made post-expansion:
Signed Pietrangelo after the Blues foolishly let him go
Stole Stone from us by selling high on Brannstrom
Acquired Stephensen, Hill and Howden for mid-round picks
Picked up Barbashev at the deadline and he's almost at a PPG
Signed Whitecloud and Thompson out of college/university
Signed Amadio after we let him go and he's been excellent in his role
They also traded for a star center in Eichel, although with Tuch's breakout that trade looks more like a wash or even a loss on paper, although I'm skeptical he'd be anywhere near as good on Vegas.
McPhee and McCrimmon are in the upper echelon of NHL managers. They built that Vegas team from the ground up and the net-out. Team is built to win a cup and they deserve all the credit.