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I think a lot of social media savvy people would be aware of the problematic nature of the phrase, but use it anyway because it’s controversial and gets attention.
You can fall back to the non Hamas aligned meaning if questioned, particularly by police.
I imagine it might get you on some kind of low grade police watchlist.
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‘From the river to the sea’ is not Hamas’ slogan. It’s an old PLO slogan and is around 60 years old. It’s not a call for the obliteration of Israel and the line that this is some kind of hugely antisemitic slogan is horseshit.
https://decolonizepalestine.com/myth/from-the-river-to-the-sea-is-a-call-to-genocide/
Projecting genocidal intent onto even the mildest calls for justice for Palestinians
The placard? I don't think (my opinion) that phrase is as clear-cut antisemitic as some on here. Yes it's Hamas' slogan. Problematic. But it's an older phrase and I would guess most using it in the UK are meaning freedom for Palestinians to live without constant fear and have rights to health, movement, work etc. Not to remove all Jews from the area ("free to live" not "free of those other people").
(Couldn't tell your intent from the post, whether you think it's a good or bad thing the police are not acting on it - whatever the wishes of HO)