“You can’t win an election without giving your potential supporters someone to hate.”
Trump emphasized that the plan would make people happy, not that it would give supporters someone to hate. Most of us support Trump because he gives us some optimism that things will change; we are not interested in hate; hate will not repair what needs to change. Most of us ARE already angry. Just mention Boehner, McConnell, gutless politicians, etc.
There wasn't any need to emphasize: just point.