I do my bit by assuming everyone else are mingers who rarely wash their hands and don't look after their own health. It's not foolproof but it's got me this far,
Before Covid, it was widely known people don't wash their hands - bar nuts anyone?
Before Covid, people would walk into public bathrooms, and have this complicated system of touching everything with tissue, avoid the perfectly good soap and water for a bit of anti-bac ffs.
Before Covid, toilet brushes cleaned in dishwashers. (are people still doing this)
Before Covid. many in society never went for any medical checkup, including those sexually active regardless of their condom use.
Before Covid, parents dosed their kids with calpol to reduce temp and sent to school.
Before Covid, parents would come up with excuses about why it would take hours to collect their sick kid from the school. Even worse, they were already throwing up/diarrhea at home.
Very few people cared enough about classmates with underlying health issues. Damn some even kicked off when food was banned because of allergies!!
People have always been selfish. We have to put ourselves first for our individual survival, even airlines in an emergency, put your mask on first before you help someone.