What is the Islamic answer on why so many places of evil are being consumed with violence?

2017 - Shooting in Las Vegas (Music Festival) = Sin of Music
2016 - Shooting in Orlando (Gay Bar) = Sin of Homosexuality
2015 - Shooting in Charleston (Church) = Sin of Shirk

Is it time to repent for transgressions?
Does Allah (ﷻ) help those who sin?
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