Oreo
BN and government thought it best at the time to give support to hamas to lesson the power of the PA.Checks and balances.
Nobody can predict the future and how things will turn out.
Netanyahu is recorded as saying his reason for letting Hamas gain more power was to counterbalance Fatah because a divided Palestine was less likely to be successful in progressing it's claim for a two state solution. Not "checks and balances," political interference for a right wing Israeli government's political aims which put left wing Israelis, who lived near to Gaza and had forged strong links with Gazans, at greater risk.