Also I just read an article from the German science magazine Spektrum, hypothesising that the second wave comes not only on the heels of cold weather driving people inside, but also because the relieving numbers of the summer gave a false sense of normalcy and people forgot that it's not just about masks, that the more people you are in contact with, the higher the risk of infection.
Yes, that's exactly it. It's also important to note that during the summer, it was possible to be more socially distant due to having more space around us, which also gave us more of a relaxed feeling, but also installed a sense of security in us that we shouldn't take for granted.