Whether you think street protests accomplish anything depends on how you define goals. If success equals getting more people to the polls, an analysis by economists from Harvard University and Stockholm University finds that protests do have a major influence on politics:
"Research shows that protest does not work because big crowds send a signal to policy-makers—rather, it’s because protests get people politically activated."
The Women's March was the biggest protest in world history—but did it accomplish any real policy change? The Tax Day March came and went, and President Trump has not released his taxes. The People's Climate March drew 200,000 people in DC alone, yet the EPA still took down climate change data from its site. Moisés Naím says street protests are just not enough:
"Behind massive street demonstrations there is rarely a well-oiled and more-permanent organization capable of following up on protesters’ demands and undertaking the complex, face-to-face, and dull political work that produces real change in government."