I have explained that at least 100 times on this forum.
Find some of my already posted detailed explanantions.
Very short answer is VACCINE DOES NOT CREATE AIR TIGHT PLASTIC BUBBLE AROUND YOU. If there are infected people nearby exuding large loads of virus, I will get infected even if vaxxed. But my body will be better prepared to fight the virus. So I prefer fully vaxxed people near me because they are less likely to be seriously sick and exhale large loads of virus.
If true then this is not a vaccine but an experimental treatment, fine then call it that. Stop pretending it’s an actual vaccine and recognize a persons right to decide for themselves.