you're totally right, let's just never trust any vaccine or medical developments due to anomalous chance of failure. in accordance to this, i pledge to never leave my home until i leave this barren earth.
The vaccine does not completely prevent you from getting infected or from being able to infect others. It drastically reduces the chance, especially of the more dangerous symptoms affecting the lungs, but it doesn't grant complete immunity.
Besides, measures like masks also affect many other diseases; this recent winter they were effective enough to reduce influenza-related deaths by over 95% compared to the year before.
“Drastically reducing the chances” is all you need, because everyone else has also gotten vaccinated and there isn’t a supply of bats dropping fresh virus on you to constantly challenge it.
The COVID vaccines really are so good there’s not much reason to take extra precautions as long as you’ve gotten one. Variants don’t even matter since it’s not the flu.
Are you sure you aren't being facetious and pretending like you have not heard any mention of the numerous studies that show vaccinated people do not spread the virus in any significant percentage and how herd immunity works?
No, I haven't seen any of those studies and I have very little personal motivation to do so as I live in NZ and the only place I care to travel to is Australia - so no need to pretend or be facetious at all.
In fact, my first actual exposure to wearing a mask was less than 3 weeks ago when I traveled to Sydney. TBH, I don't know what the big fuss is about.