Jeet Heer writes:

Yet it’s worth reminding ourselves in the not too distant past, the exact opposite strategy was followed. In the 1970s both the United States and Israel thought that secular left-wing Arab nationalism was a bigger threat than religious fundamentalism. For that reason, Israel worked strongly to empower Hamas and undermine Fatah.

And he points to a UPI article:

Israel and Hamas may currently be locked in deadly combat, but, according to several current and former U.S. intelligence officials, beginning in the late 1970s, Tel Aviv gave direct and indirect financial aid to Hamas over a period of years.

Israel “aided Hamas directly — the Israelis wanted to use it as a counterbalance to the PLO (Palestinian Liberation Organization),” said Tony Cordesman, Middle East analyst for the Center for Strategic Studies.

Israel’s support for Hamas “was a direct attempt to divide and dilute support for a strong, secular PLO by using a competing religious alternative,” said a former senior CIA official.