Fact is for most of the population, especially the poorest, the dictatorship was not as oppressive directly against them. The secret police was going after intellectuals and universities. And censoring media of course. The average person only cared because the dictatorship was running the country economy into the ground.
My parents were in their early-to-mid 20s when the dictatorship ended here, and my mom speaks fondly of our dictator Salazar. She lost 2 out of 12 brothers and sisters — 3 months and 4 years old, respectively — to perfectly curable diseases, and 2 others are crippled because of health complications when they were children. None of the 10 that made it to adulthood studied past the 6th grade. My dad was sent to a Catholic boarding school 300 km away from his mom when he was 10, because she couldn't feed him; he only studied until the 4th grade and started working when he was 11 years old.
My mom votes for Chega, the far-right party, and my wife is an immigrant (and I'm an ex-emigrant). She resents her life, and Chega rides on that resentment. It's very painful to see loved ones drift into this hate.
Before the economic recession and hyperinflation, Brazil enjoyed an economic boom: the so called "brazilian miracle". Many brazilian industries became successful during those times. Including the steel industry my city is built around.
Today Brazil is just the world's soy farm. To put it mildly. The country of wasted potential.
It's also a well worn play book at this point to have people vote against their interests when given some enemy: religious or ethnic minorities, atheists, immigrants, a foreign power, etc...
In any case I completely agree with all your points. Just that the situation is even more dangerous when the society has no experience dealing with dictators.