Stray kitten

I just got to get this off my chest .where I live at we got stray cats . This older lady feeds them so of course they stay around. Well this morning I' realized she had 3 new kittens out there.well me being me I go look at them .I noticed this one here and she wasn't moving as much and was a lot smaller. So I kept watching them play and stuff this little thing was getting ran over by the other kittens . Well she started moving and listen this poor baby couldn't move her back legs . Her eyes was all messed up .so here iam feeling so bad I take this baby to get checked out .her legs was messed up since birth and i bet this old lady knew about it. So I cryed all the way there hugging this baby named her faith . Well I left with no kitten they had to put her down ... I felt horrible to why people let's cats out not fixed .and they breed with each other. So rip little baby