Unscrupulous Contractor

You don’t choose a target for Unscrupulous Contractor’s ability at the time it triggers. Rather, a second “reflexive” ability triggers if you sacrifice a creature this way. You choose a target for that ability as it goes on the stack. Each player may respond to this triggered ability as normal. Notably, the triggered ability isn’t a crime, but the reflexive triggered ability potentially is.

Exiling a card using its plot ability is a special action. Once you announce you’re taking that action, no other player can respond by trying to remove that card from your hand.