Crying means you are brave
Most people don’t want to seen as weak by others and wear an emotional mask before coming out of their rooms or leaving their house. For most people, openly crying also seems embarrassing. Only someone strong can let their guard down without fear of being judged.
Since sadness has negative associations, we often won’t reach out to someone we notice is experiencing difficulty because we’re afraid, not of the person necessarily but of the act of being deeply upset.