There is a significant chunk of the voting public - maybe 30-35%? - that identify with MAGA.
Trump packaged up American exceptionalism, old-fashioned American values and pride, border security, non-interventionist military philosophy, fair trade, American manufacturing etc. and branded it MAGA.
Name another politician whose campaign slogan has become a movement representing a third of the country?
Whether his policies fully lined up with the vision is debatable, but MAGA is an undeniable success.
Trump changed many policies that devoted billions of dollars away from oil production and other things. The people who are in charge of all of this and own it also have their foot in the media business. So they sent to task of demonizing every single thing Trump did and weaponize the media to get him out of office so they can continue making billions of dollars.
Whenever you ask why, just follow the trail of money to get to the truth