Because Life itself is a challenge, everyone goes/will go through ups and downs. And sometimes suffering just makes a person stronger 'coz if the day comes that she will go with the same suferring/problem she went through, she's smarter and more confident to handle it.
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They suffer because...
*they are too kind
*so full of mercy
*acting like a fo0l (because they know what will happen but still going)
*middle of a clash (implicated/nadamay)
*they are jealous to the victim
*his/her family/friends have some sins and that sinners revenge it to him/her
*the way she/he acts. Its normal to him/her but other thinks it is an insult or bad attitude/bad
life f*cks us all. sad reality but we need to accept it.