I had to take a homeless person sensitivity training (4 hours) in my line of work (social work), which to me is like a professional deep sea diver taking “how to swim 101” but to each their own.
Within the first 30 min, the main selling point of the gentleman giving the presentation was “be a good person”. Show empathy. Treat them like a human.
That’s what you’re doing. You mean well; I’m not here to dog on your post. But it’s intentionally condescending and you know it. Still, your advice is lost on people because all personalities play OW2. Is it worth your breath to say? Sure! Does it apply to every situation? Absolutely not.
You’re advice boils down to “be a good person”. It’s good advice, but won’t work in all situations. For me, I try your advice and devolve to “disappointed dad”. I say, “ok 2 mins left in the round, if we wanna do any swaps, let’s do 'em soon”. Sometimes, I’m met with silence + some swaps which is AWESOME! 
…other times I’m met with, “and what are YOU swapping to?” Immediate sarcasm and anger. I say, “what would you like me to swap to?” And they say “one that you can actually play” or “one that can heal”.
So now, if I go further with the kindess that’s slowly devolving into passive-aggression, I’m now in territory to get reported. My name is now remembered, I’m a target as the guy who spoke. I’m the catalyst and I’m the scapegoat for their failure. We lose this, I’m going to take the fall. I can continue by saying, “would you like me to try Ana?” or “Ok how about Kiriko”. MAYBE they’ll say, “do it” or “that’s fine” or “whatever”. Maybe they’re silent.
The point I’m trying to make is, you’re right but it doesn’t work every time. This community is FROTHING and toxic and OW is a heated environment, like at least 3 people’s energy in any given lobby is at an 11. Staying calm and reassuring is good advice, but really try to read a situation and knowing when to stay quiet or disengage is also good. Stay safe out there because all it takes is a few reports to get silenced.