Throughout history, there have been world leaders who resigned for reasons far less serious than the tragic Beirut Port explosion, be it due to revolutions, over allegations of corruption, or of old age.
In 1936, King Edward VIII of the United Kingdom and the Dominions abdicated to marry American divorcée Wallis Simpson, despite lots of disapproval. In other words, he stepped down for the love of a woman.
In 1955, Churchill, who led Britain through WWII, resigned as the Prime Minister of the United Kingdom because of his declining health. He was 80 years old. For reference, Lebanon’s President Michel Aoun is 86.
In 1973, Spiro Agnew resigned as the Vice President of the United States as a result of a financial scandal and corruption allegations. He was convicted on charges of bribery, tax evasion, and money laundering.