Republicans understand the power of appealing to emotion and "othering." They have spent decades training their voters to vote against their own interest because it will hurt people that Republicans say are preventing their great success. Trump said he had "concepts of a plan" on healthcare and voters think he had more of a platform than Harris because his main points were about getting even with the world. Make the world pay what it owes us and get these immigrants out of YOUR country.
Democrats get punished for trying that too blatantly. Republicans and Democrats are playing different games when it comes to campaigning and propaganda.