I hate to be the one to say it, but in some cases I can see why some people might be reluctant to engage. I know that for my own part, I am generally disinclined to engage in genuine, kind, compassionate, and empathetic ways with people who treat me with what can feel like open hostility. It's almost always less emotional labor to tell them "Have a nice day" and walk away, putting them out of my mind. My making this choice does nothing at all to further any kind of constructive engagement, and certainly nothing to improve their lives or alleviate their pain and suffering, but it does make my life easier that day.
Again, you're completely right. Techrbos need to engage! It's just that at times it can be challenging to convince people of this basic truth when they find unfriendly receptions.