While what your saying is fundamentally true, it is worth noting that companies do notice declines in sales even very slight ones, and while there isn't ethical consumption there is certainly still a wide range of how unethical companies are. Just cause none are great doesn't mean they are all equally bad.
It is also worth noting that mass voting with dollars is one of the most effective peaceful tools currently available in a capitalist system to drive change (for non essential/non monopolized goods). Things like fair trade chocolate and sustainable packaging types exist because consumer demand for them is real, and if enough consumers demand and change spending habits for fair wage practices and bare minimum corporate ethics standards it will start to happen too.
Obviously this is all easier with more coordination among the consumers but even without it, we see companies change their practices due to consumer backlash that hits sales now. This is more effective than you may be giving it credit for, even if not as much as we would like
Look guy I want to tear the thing down as much as you, but until that gets started this is what I got. In order to be successful in either will require some better commraderie than the tone you seem to have here