Anti-war demonstrations are a form of militant lobbying. Even radical direct action and civil disobedience aim to convince power-holders to do something different. This faith in government is misplaced.
There are two sides to this war. One is the war among imperial powers. The other is the war between the global capitalist class and the global working class. Both are heating up.
Capitalists are afraid to let workers play an active role in ending this pandemic. They prefer technological solutions, however ineffective, that keep them in control.
Socialism is the Best Medicine