Are there no lines the op, or you, would not cross in the pursuit of your engineering work? Perhaps you're okay with Coinbase's mission specifically, but are you saying that you're okay with _literally anything_ in the pursuit of good engineering?
Perhaps you and the OP would be quite happy, say, writing code for a lab that makes novel fentanyl analogues for the express purpose of including them in black-market knockoff heroin powder, which in turn leads to a number of deaths (accurately cutting in your microgram-potent meds is hard, and sometimes your downstream supply chain makes a hit that's got too high a fentanyl analogue/cut material ratio, go figure!), or an industrial system that captures unsuspecting babies to then drown them, strip their flesh, and harvest their valuable bones (not really that realistic in our normal reality, but per http://www.bay12forums.com/smf/index.php?topic=25967.0 it works great in Dwarf Fortress! or it did, anyway, until that got patched out because of said bone harvester), or hell, let's just Godwin on it and say you'd be perfectly happy writing automation tooling to make Treblinka 10% more efficient.
The respondent, whom you so readily chastise, has a quite valid point that we can't separate our engineering work from "politics" (ethics, really, but there does seem to be a side in this debate that prefers to say "politics", since that evokes more the admittedly annoying horse race electoraliasm and doublespeak-driven world of actual politics and takes away from the thrust of the issue, which is ethics, which happen to often overlap with politics but are very much their own thing) ever. That's an important thing to recognize, especially in an industry that has persistent issues with laying ethics aside in pursuit of "great inventions" (let's be pragmatic, it's mostly in pursuit of profit, with some good inventions as an occasional byproduct).
What I think the respondent may be getting at is that there is a significant population in the industry that probably does have some lines they won't cross, but is privileged and willing to cross a great many lines that won't affect them personally. You perhaps think that's a laudable stance, and you can hold that opinion if you wish, but you should do so with the recognition that there are a number of people that will see that less as a commitment to honorable professional detachment and more as a willingness to trod over the rights and wellbeing of the less fortunate so long as it doesn't injure you immediately. I'd argue that it's important thing to at least consider in an industry that often speaks of changing the world for the better--perhaps that was more it drinking the consultant kool-aid about what millenials value in their work and deciding it needed to work that into messaging, if not action, but hey, if it wants to say that, it ought to put its money where its mouth is.