I’ve been to both a Raiders game and a USC game in the Coliseum. USC games there wasn’t an empty seat in the place and it holds 90,000+. I’ve seen more people at a HS Football game than would attend Raiders games in LA. The Raiders hosted the AFC Championship in the early 80’s and it was blacked out in LA because it didn’t sell out. People in LA won’t attend NFL games. Never have and likely never will.
They did in the late 1960's, when George Allen was the coach. He was very popular with the public. In 1968, when Rams owner Dan Reeves announced that he was firing Allen, the public outcry was so great that he relented and kept Allen on for two more years.