The Blazers offered him the incentive - and we're supposed to criticize him for responding to it? That just doesn't make sense.
The whole point of incentives is that they change behavior. If the Blazers didn't want that to happen, and/or didn't understand that nearly any incentive contract might create a conflict of interest between the two parties, they shouldn't have offered the deal.
Not that they should be upset. He shot 18% and 28% on 3s in the previous two years, on lower volume. It looks like the deal achieved what they wanted, in terms of overall performance for the year.
And as SL points out, if he was in a slump he *shouldn't* have been taking those shots, even from the team's perspective.