That applies to the kill switch case, but not the tracking case. Retaining control of a thing shifts responsibility. Marking a thing does not. And if you want to find out where the responsibility for misuse falls, all you need is to learn about the supply chain.
Yes, but at least some believe this is because it’s pragmatic to stay focused instead of trying to fix all the wrongs:
why not immediately begin using all the tools, mechanisms and strategies used for FOSS advocacy to advocate for these other causes? The TL;DR answer is simple: because these tools, mechanisms and strategies are highly unlikely to have any measurable impact on those other causes, while using them for these other causes would ultimately minimize software freedom and rights unjustly.