Actually, the biggest enabler of Hamas was Benjamin Netanyahoo, who was happy to use it as a foil against the more moderate Hamas and the Palestinian Authority.
"Look how radical these Hamas guys are....we can't negotiate with them!"
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www.haaretz.com
That’s because since he took office as prime minister a second time in 2009, that same Netanyahu developed and advanced a destructive, warped political doctrine that held that strengthening Hamas at the expense of the Palestinian Authority would be good for Israel.
The purpose of the doctrine was to perpetuate the rift between Hamas in Gaza and the Palestinian Authority in the West Bank. That would preserve the diplomatic paralysis and forever remove the “danger” of negotiations with the Palestinians over the partition of Israel into two states – on the argument that the Palestinian Authority doesn’t represent all the Palestinians.
That flawed strategy turned Hamas from a minor terrorist organization into an efficient, lethal army with highly trained, dehumanized stormtroopers, bloodthirsty killers who mercilessly slaughtered innocent Israeli civilians including women, children and the elderly.
This is solidlydocumented. Between 2012 and 2018, Netanyahu gave Qatar approval to transfer a cumulative sum of about a billion dollars to Gaza, at least half of which reached Hamas, including its military wing. According to the Jerusalem Post, in a private meeting with members of his Likud party on March 11, 2019, Netanyahu explained the reckless step as follows: The money transfer is part of the strategy to divide the Palestinians in Gaza and the West Bank. Anyone who opposes the establishment of a Palestinian state needs to support the transfer of the money from Qatar to Hamas. In that way, we will foil the establishment of a Palestinian state (as reported in former cabinet member Haim Ramon’s Hebrew-language book “Neged Haruach”, p. 417).