The word 'Israel' contains the suffix, 'El', which in Hebrew means 'God'.
According to biblical folklore - a nice secular way of putting it, no? - Israel was the name given to Jacob, son of Isaac and grandson of Abraham, patriarchs of the tribe of modern-day Israel, all of them, as a result of having wrestled with presumably an angel sent by God all night until daybreak, literally, physically, man-to-man, for angels in those days walked the earth like ordinary people did, a name meaning 'He who struggles with God'.
What? F*% he who struggles with me, as God would say in response to someone saying 'F*%k Israel for reasons of his/her own, since he, God, identified by name in the suffix 'El', was uttered in the same breath when he was cursed by whoever it was that cursed Israel?
Well, well, well, let's see about that, shall we, who f*%ks whom, as the imagined reply would be, although God, holy as he was as declared by himself to be, again, according to biblical folklore, wouldn't be expected to stoop to such low levels of vulgarity no matter what. His imagined response, in line with his good name, high office and holy reputation, would probably be something along the lines of 'okay, foul-mouthed mortal, let's see who curses whom' and so on.
So, do be careful the next time you're tempted to say 'F*%k Israel', as God, as identified by name in the suffix 'El' in 'Israel', might not take it too kindly as his name was mentioned in the same breath when you cursed Israel with such an expression of your hatred.
Incidentally, you might also want to be careful when the temptation to curse people with names other than 'Israel' arises for whatever the reason as many names, be they Jewish, Italian, Spanish and so on contain the word or suffix 'God' in them, names such as Gabriel, Jewish, which contains the suffix 'El', or 'God' in Hebrew, Giovani, Italian for 'God has shown favor', Juanito, Spanish for 'The Lord is gracious' and so on.
What a minefield this booby-trapped world of ours was, wasn't it?