@Kronous
Tears are cleansing. Normal tears get rid of dust and grime in the eyes, and sad/happy tears actually relieve you of excess emotions (hormones). https://www.discovery-zone.com/chemical-composition-tears-varies-depending-cry/
That said, not everyone cries for the same reasons, but there's definitely nothing wrong with crying (and it might be unnecessary stress and possibly even unhealthy to not cry when you want to - but in an unhealthy environment it might of course be stressful to actually cry, so again ymmv).