I'll attempt to explain using some good old American history.
So, there are the two groups of people:
Those being prepared by cancelling large events and gatherings (such as concerts or schools), staying home, keeping calm
And those going on vacations, sharing food/drinks, setting up large festivals or gatherings, and acting like nothing's happening because "it's just a flu"
I'm going to represent those mindsets using the cities of St Louis and Philadelphia, during the horror that was the 1918 pandemic-
St Louis was extremely quick to act, cancelling all schools, gatherings, festivals, concerts, telling people to work from home, taking every precaution they could before there was even a single case in the city.
Philadelphia, on the other hand, despite being urged not to by medical professionals, held the city's largest parade, with hundreds of thousands of people crowding together to watch the show.
While at first St Louis was looked down upon for being so restrictive over a flu, people's minds changed very quickly once the sickness started spreading, with Philadelphia being the main center of the outbreak.
Due to the insane rise of cases in such a small area, hospitals were unable to treat most of the patients, and millions of people lost their lives because of it.
St Louis, however, had one of the lowest death rates in the US, even though the cases were still quite high in the end. This is cause even though the disease still spread, due to the lack of socialization, it spread very slowly, allowing the medics to keep up with treatment.
If you want more recent examples, look at South Korea vs Italy. They were both hit hard with Coronavirus, but Italy was much less prepared, and now they're having to choose between saving the life of a 40-year-old mother with three young kids, a 60-year-old with high blood pressure, or a 20-year-old with severe health conditions, all while people are dying in the hallways due to lack of beds.
There's a reason everything's being shut down so early. The cities aren't being over-dramatic. Lives are at stake, and they're doing what's been proven to work in order to save innocent people.
Sorry if that gets in the way of your summer vacation plans.