1. People with compromised or weak immunity are still at a risk
The vaccination trials did not have people with compromised immune systems involved. Therefore, we cannot assume that the effectiveness rate is the same among everyone.
2. The vaccine takes time to work
The vaccine is not designed to give immediate results. Therefore, if you violate social distancing protocols immediately after getting vaccinated, you are as exposed to the virus as someone who has not been vaccinated. It takes a good two weeks after the second dose of the Moderna or Pfizer vaccines for the effectiveness to reach 95%.
3. Vaccines are in limited quantities
Ideally, the purpose of creating vaccines was to have them reach every corner of the world and create herd immunity. However, that is still not the case, and we are far from getting to herd immunity- given that new variants keep popping up every day, and corruption and black markets only make it harder for them to reach people.