It's because most of the left shuts down critical thinking if you say a bill is for ending sex trafficking. It ends their ability to think rationally or challenge the rest of it. It's the reason politicians use the: "it's for the children," bullshit - it ends debate & challenges. That same contingent, mostly the left, were the ones protesting ending net neutrality.
You had the NY Times and Washington Post both supporting the Cloud Act as a good idea, by pushing pro opinion pieces.