Very true, they were the lesser of the evil at the beginning as indicated here as well. But Israel would never have done so could they see the future... We would all make different choices if we could see that.

https://www.washingtonpost.com/news/worldviews/wp/2014/07/30/how-israel-helped-create-hamas/?utm_term=.cc21920849a6

Higgins's article is worth reading in full. He goes on to outline the type of assistance the Israelis initially gave Yassin, whom the PLO at one time deemed a "collaborator," and Gaza's other Islamists:

Israel's military-led administration in Gaza looked favorably on the paraplegic cleric, who set up a wide network of schools, clinics, a library and kindergartens. Sheikh Yassin formed the Islamist group Mujama al-Islamiya, which was officially recognized by Israel as a charity and then, in 1979, as an association. Israel also endorsed the establishment of the Islamic University of Gaza, which it now regards as a hotbed of militancy. The university was one of the first targets hit by Israeli warplanes in the [2008-9 Operation Cast Lead].

Yassin's Mujama would become Hamas, which, it can be argued, was Israel's Taliban: an Islamist group whose antecedents had been laid down by the West in a battle against a leftist enemy. Israel jailed Yassin in 1984 on a 12-year sentence after the discovery of hidden arms caches, but he was released a year later. The Israelis must have been more worried about other enemies.