I agree - but let's remove "dumb". Rather, let's call it "emotional" buyers and voters. That is my wife and my youngest daughter (attending Stanford right now). Both have IQs well above 140.
On paper, they should, without question vote Republican - economy, immigration, crime, immigration, inflation, immigration, etc.
They see Abortion and it is both a policy and a symbol. It is about what (mostly) white men want to do with their bodies.
When you understand the symbolic value, their world view becomes clear and, to some extent, understandable. Who cares on inflation if you have a baby that you do not want, a father will not support, the state will not support, and your career and dreams are over. Make every religious or moral argument you want, this is how this is viewed and it is showing up, again, and again, and again, at the polls and in critical races.
Take abortion off of the table, and Republicans win in massive margins. And - if you think that Trump is TRULY pro-life, you are nuts. To his significant political credit, he was savvy enough to know that this was a way to get a hesistant part of the Republican base to support him. He would go back to being pro-choice as he wants no part of this discussion.