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.
For centuries, people have known how to eradicate infectious disease: stop person-to-person transmission. Unable to solve this basic problem, the capitalist class are abandoning us to needless mass death and disease for the foreseeable future.
Socialism is the Best Medicine