I'm sorry, but I think in many cases a road block does "just make you look bad". There was growing support for BLM in Massachusetts and it got popped like a ballon when those dumb kids blocked 93N.
Nobody was talking about how the cops dealing with the situation were one of the most racist police organizations outside of the Deep South. They were busy talking about how those dumb kids could be killed and the traffic they caused affected ambulences and some patient almost died.
off supply lines to financial districts or big corporations and put economic pressure on them
Again, using BLM as an example... Don't you want to have those corporations SUPPORTING the BLM movement? I mean, unless your protest is laser-focused on anti-capitalism, hurting businesses for no good reason just alienates the 99% of the population that isn't Tankie.
That same topic about "educating people how to protest" is "pick ONE thing you want to change, or your protest doesn't have a meaningful message". If you're protesting for the environment or protesting for women's or gay or trans or minority rights, you shouldn't be protesting against businesses. You should be recruiting them. I wanna walk into the office (after no traffic jam) and see someone having anonymously put up "Gay rights are human rights" posters everywhere. I want my place of employment to offer to match donations for these causes. Etc.