We really dont know why any tragedy happens maybe some big Tzaddikim can be privy to such info, however unfortunately there are enough things going on that it can be anything. Eretz Yisroel is the Land of Hashem the land of Kedusha, the Land that Hashem is always looking at, any sins committed there are treated much more strictly than sins committed elsewhere as its like sinning in the Kings Palace. Theres so many unaffiliated Jews in Israel as well as a number of affiliated Jews not behaving correctly. Additionally all Jews are connected and Chas Veshalom the sins of Jews in one place of the world can cause tragedy in another place. Halevai we would be on the level that we do so few Aveiros that we could pinpoint what caused a tragedy!
When ever these things happen Hashem is trying to wake us up. However how many of us truly wake up? Even if we say a few Kappitlach Tehillim, is that it?! Is that all?! Are we now ok and able to go on with our lives pretending we care and we did our part? If we are not living how we should what good is our 2 Kapitlach Tehillim?! Hashem wants us to come close to Him, not to say 2 Kapitlach and go on with status quo and living mediocre lives.
Even if we cant do a total Teshuvah, at least start the process. Start doing something different. Work on Emunah and Bitachon. Start Davening to Hashem, pour your heart out, not just paying “lip service” plead with Hashem that He should help Klal Yisroel and that He should help you be a better Jew and serve Him properly. I really feel like Tefillah is an area that we are seriously lacking in.