I don't think people are being more careless about it. I just think they are not as afraid of it like they were when the pandemic began.
We were asked to wear masks so we wore them. We were asked to stay at home so we stayed at home. We were asked to stand at least 6 feet apart so we did. We were asked to get vaccinated so we got vaccinated and yet, COVID is still around and many who complied with the mandates are still catching it.
It's no wonder why many people are saying, "I might as well not wear a mask, not stay at home, not get vaccinated since doing those things aren't guaranteed to prevent me from getting it".