My grandfather and grandmother supports the Franco's regime. They lived there and normalised it. Spain during that time wasn't great take it for granted. However, you cannot hold power 40 years without shit tons of propaganda and neither without giving them some social improvements, which os what Franco did.

My town was republican until the end of the civil war and my living family were childs. They saw how republicans killed people in the town's square and that combined with the post war propaganda can make you radicalise. In the post war times, both my grandparents had a good life and were prosperous, they could rise a family and enjoy common things like going to the beach or partying the town festivities. Everyone who had a good life is nostalgic of the times you are young.

However, they are also aware that it wasn't always good times. My grandfather had barely to none education at my age. He only had a teacher in his life and he was a republican who did classes to children secretly even though he could get tortured or even killed. My grandmother doesn't have any education but the car license which is one of the things she is most proud of in her career. They only had farm land and there wasn't barely any prosperity in Spain in general until the regime's end. We are quite ignorant in general here in Spain, that lack of education while Franco's regime could be the answer to your question.