I've never attended a public protest in my entire life, but I'd seriously consider doing so (if I thought public protests achieved anything, but they do not) Protesting against G-Bay.
1963 Civil Rights March on Washington
Civil disobedience movements in the US, India and South Africa
'Solidarity' protests and strikes in Poland 1980
The 'Peaceful Revolution' in East Germany in 1989
I could go on...
None of these protests achieved anything?