The War of Gaza and Israel. Hamas has changed beyond designation over the years

In connection with the Hamas rocket attack on Israel, 2 basic questions arise: who supplied Hamas with 3,500 rockets, and why did no of Israel's intelligence, especially Israeli military intelligence Aman, detect a trace of preparations for this massive operation? Hamas – a charity at its beginnings, has evolved since 1987/1988, transforming from a charity to a fundamentalist terrorist army that came to power in the Palestinian Authority as a consequence of the elections, and then seized Gaza region by force