..there's only one absurdly plausible explanation: Israel/Mossad has teams of roaming, mind-altering malevolent Derren Browns out there targeting high-profile but ethically/cerebrally weak, malleable Palestinian supporters.
The US's MK Ultra program was ostensibly cancelled in 1973. Obviously Mossad would never have had any interest in creating their own version, now would they ? Interesting comments here on so-called "monarch (re-)programming" of "civvies":