Israel kept taking more Palestinian land and expelling more Palestinians as internal refugees in an increasingly smaller space, but even then the resistance was secular and largely led by socialists.
Only much later after Israel assassinated many resistance leaders did Hamas finally emerge to fill the gap. In many ways, Hamas is Israel’s chosen enemy.
The causality I presented is correct. It’s entirely natural for indigenous people to resist their occupiers, violently if needed. The entire resistance and Hamas in particular only exist because the occupation existed in the first place.