I think a couple of things are in play. People are getting tired of masking up/staying home and being overly cautious and people who have been boosted or double boosted feel invincible. The latter was the reason why our family got it last month. My wife got double boosted and went on a 5-day cruise with her best friend. She felt super-protected, so she didn't wear a mask at all when inside the ship, so she caught it and brought it home. On the flip side, we went on a 14-day family Disney cruise in March and didn't catch it because Disney required everyone to wear a mask indoors.
We have to understand that the vaccination does not prevent us from getting Covid. It only prevents us from having severe symptoms that require hospitalization and death.
With that said, I think we're at a point where Covid is going to be endemic and we're just going to have to live with it. I don't think we (Americans) have the patience and tolerance to wear a mask indoors for the next few years. I've been guilty of walking into a store not wearing a mask if I'm only in there for less than five minutes.