If I was Rick, at this point, I wouldn't give a shit about people's death anymore outside of the immediate group.
Why would you? Don't get attached to new people, keep your immediate group small and intimate and safe and neglect all others and expect them to die, like they most likely will.
Actually, as a matter of fact, why live at all? Why even fight? The world you're living in is completely devoid of hope, happiness, optimism or joy, it's a literal nightmare every waking second. Life isn't worth living at that point. Like, if you were in the zombie apocalypse and were able to build a stable community where you've gotten 100% safe and comfortable and can enjoy life, sure, but these guys are fucking death traps. All they know is misery and pain, so why fight so hard to live when you'll inevitably only ever know pain and misery and fear?