As icaro pointed out supporting Palestine isn’t a far left rhetoric in many places like it is in the US.
The only reason so many left wingers even support Palestinians so ardently is because it's the latest social cause célèbres, which they're all about. But if their activisim weren't so performative and they actually did some research into who and what they're so busy tweeting about, they'd realize just how incredibly conservative the Palestinians are compared to even Israel (its government and religious oligarchy notwithstanding.)
These same people would never show the same support for an American who's even 1/10th as conservative as your average Palestinian or who sports the sort of extreme ideologies they often do. I'm not endorsing similar blind support of our own conservatives, as I don't agree with them on most issues, but if that's not irony, I don't know what is.