Mandatory vaccination will ensure HERD Immunity (lots of people in a community are vaccinated). This will also help when a person gets COVID-19, it will be harder to infect others because their bodies are ready to fight the virus.
Negative Stand
Forcing people to get vaccinated may reduce morale (overall mood of the community), because of that, some may now be aggressive to the government. Even if they still get vaccinated, some people may suffer lots of side-effects (e.g. headache) and may complain.