I'd sadly have to agree with bumcrapulence.
I'm not saying that the Palestinians don't do terrible things and commit human rights abuses themselves because they do but the occupation is wrong and Israel, while admittedly not trying to kill civilians, hasn't tried hard enough not to do so - and the settlements are clearly wrong as you just can't have settlements of one country in the middle of another. It's not fair and it's not right and the occupation really is the cause of so much of the conflict (although it's not as if the Arabs hadn't tried to destroy Israel before the occupation of the WB and Gaza - or that Jordan and Egypt hadn't occupied them before Israel).
Also, as Coruskate pointed out, Israel is a democratic country with a clear rule of law and therefore a responsibility to conduct hostilities in accordance with international conventions.
She's also right though that it is a difficult and complex situation. That's why the boycott of Israel is just a simplistic response. And the demonisation of Israel is, in my opinion, fuelled by more than just concern over the Palestinians.
I think because I'm probably more of a 'do-gooder lefty' by nature that I feel almost a betrayal by the left with their inflated response to Israel to the exclusion of others, personified by people like Ken Livingstone. When I lived in London, I couldn't vote for him because of this issue and found myself forced to vote for Boris Johnson even though my natural leanings would be to Labour.
And when I see members of the British left-wing groups marching with Hamas and Hizbollah, groups who are so contrary to everything they supposedly stand for but the main thing is that they're anti-Israel, the betrayal is even deeper.
This C4 documentary on how the anti-Israel movement and anti-semitism have joined forces in the UK is quite enlightening