24 years ago, I recall diesel being $1.25/gallon, and hamburger meat at a little local grocer for $1/pound any time they had a sale.
Now, even going to Costco, their ground chuck is $6/pound.
If you look at the timeline, and the demographics of voters who lost enthusiasm for Biden between 2020 and 2024, it looks like a whole lotta the Americans living paycheck-to-paycheck decided to vote their pocketbooks.
Vs. back in '72, when Biden was just getting elected to the Senate, Pres. Nixon was a noisy anti-inflation zealot. (Not saying Nixon was sane, nor legal...) Since Nixon was re-elected with >60% of the popular vote - in spite of negatives like the Vietnam War - I'd say that the Dem's failure to follow a so-obvious winning reelection strategy was exactly what handed Trump the opportunity to make the decisions which you so strongly dislike.
Incompetence or malice? Both is also possible...