Comment by FireBeyond

And while Arafat was responsible for many abominable actions and many, many casualties, let's not forget that one of the first supporters of Hamas was ... oh yes, Netanyahu. Because Arafat, for whatever reason or reasons in his final years softened and the PLO was increasingly being seen by the world as the one willing to negotiate while Israel didn't want to, which made for uncomfortable questions of "why is a terroristic organization willing to figure out how to get to peace while a supposedly peaceful nation is not".

Netanyahu and his ilk realized that rather than a rapidly moderating, rapidly gaining sympathy and support PLO was not the enemy they "needed" for their own agenda - "from the river to the sea", which, let's not forget, was actually Likud's official election slogan in the 70s and 80s (a "hilarious" irony when certain people try to point to Palestinian usage of this as a "gotcha" - "See, they want to exterminate us!"), and that IDF intelligence showed that Hamas was likely to be more extremist and thus garner more sympathy for Israel, so Israel started supporting Hamas' rise.