At a population level, the less we move around, the more we stay in, the slower a disease spreads. The more mobile a population, the quicker it spreads. This is really obvious.
A lot of people here are not giving advice based on whether they think one individual will be safe (probably yes) but based on whether this is the right thing to do as part of a wider population (almost certainly no).
The fact of the matter is, when people say they plan to "go about their daily life, not going to let a little bit of corona virus stop me!" there is a huge probability they are right.... personally. However, if everyone who is going to catch the virus catches it quickly and at the same time, the NHS WILL be overwhelmed, and the case fatality rate WILL go up. If we all keep going on holiday, to football matches, concerts, etc, more people WILL die. You will, also, of course, increase your own chances of being in this number, but not hugely.
Now of course, it will be very unlikely for there to be a direct line of causation from one person going on holiday to any individual's death, but on a statistical basis, just as more travel causes more global warming, it will also cause more death from covid-19. Of course, we don't stop travelling due to global warming concerns, either. Washing your hands and still travelling to, say, Thailand is like recycling your coke can whilst... well... travelling to Thailand (sorry Thailand!).
So, are you on team society, or team virus?