Why are some people so empathetic

I'm not a sociopath I have a fairly normal level of empathy and am mostly sympathetic if anything. But theres people that will cry over anything, I had a friend cry over a homeless dudes carboard poster, because it had squiggles and stars and was decorated with effort. I mean I get it but crying over it is crazy. How are some people so empathetic that they'll cry over something thats pretty minor and cry basically everyday. I don't get it. Idk if this is a sign of empathy but also constantly upholding social justice movements, I couldn't be assed unless it affects me, like idc to spread awareness over shit.

Maybe I just suck idk.