Sure, you have a good point. Fear isn't silly, but there's a balance to strike. If after three vaccinations you're still so scared of the possibility of getting COVID (as long as you're not extremely frail or elderly) that it's causing you to not enjoy yourself or do healthy activities like go to the gym, you might be overly cautious.
Fear is a good indicator to think rationally as bout things. But if fear becomes irrational and compromises your everyday life, that's when you should ignore it. Everything you feel can be in a healthy or an unhealthy way you gotta draw the line somewhere. And for extreme cases, we have therapists.
If you want to be really safe you can choose to never leave your house, but I'd say that's no life. There's always going to be some risk involved with whatever you want to do and it's not always going to be a risk that's reasonably manageable.
I think telling someone not to worry about getting COVID after three vaccinations (as long as they are not extremely frail or elderly) isn't telling them to "go die" in your words, it's common sense.
The vaccine just reduces the likelihood that you will get seriously ill if you get the disease, it doesn't make it zero. With it being a zoonotic virus it does all sorts of mutating and random things over time, so the vaccine may not permanently work for anyone long-term. It's not far beyond the realms of possibility that we could end up in another global outbreak situation. Wouldn't that be fun.
At the bare minimum I would recommend everyone to stop licking each other. Also wash your hands when you go to the bathroom so many people don't do that it's ridiculous.
To be fair, I never said three vaccines makes COVID zero risk, the implication was that you shouldn't be living you're life in fear due to COVID unless you're seriously frail or elderly.
I'm not precious about the precautions that other people would like to take and I respect the wishes of people that do want to take their own further precautions, it's a free country.
I was vaccinated four times (in Germany) but I also had some light issues with respiratory diseases all my life and I'm in my 50s which also elevates the risks of infections.
Decide for yourself. Gym definitely is a good place to get healthier. Most of the times.
When if I go to the gym it's a combination of terminator wannabes or people who are just hanging around sitting on the equipment but not actually using it because they are conducting a 45-minute conversation.