merciful doesnt mean what many people can (mis)interpret it to be. mercy is combining strict justice and lovingkindness in perfect harmony. yes, things might happen which SEEM, to be negative and bad from G-d, but we should KNOW that everything is for the best, even punishment, just think of a parent hitting a kid in order to teach him/her a lesson, the only problem truly is the kid (us) , not seeing the message in the "bad" and punishment and correecting ourselves,
for example- look at the Israeli-arab conflict, G-d keeps sending messages via the terrorists in that the more we try to make the perverted peace procress- which the more soo the terrorist attacks, this is supposed to make people wake up and fullfill the commadment of either (whipping them out or kicking them out, depending on how we hold) , but no soo theirs more, and more and threw this G-d is trying to make the Jewish people wake up and be able to trully think and then repent.