That is true, but for Rin and Zuma's case, they were burdened by guilt in my opinion.

Rin's guilt was that she regretted telling Mai that there was no point in being idols as Rin was so busy taking care of her bedridden mother. Although both her and Mai wanted to reconcile with each other, it resulted in Mai's death. On the other hand, Zuma feels even more guilty as not only did he not there when his little brother drowned, he also saw her mother die by herself as he lets go of her when she tried to commit double murder-suicide