I want to March for Gaza but can’t…

I would like to march against Israel, really. I don’t think that bombing campaigns like the one we currently see are the answer at all. I am appalled by its dead, especially the innocent victims within it.
I am a member of the Left Jewish bundle, and was a long standing supporter of parties such as left wing Israeli Peace party Meretz and organisations like the shared Arab / Jewish village Wahat al Salam ~ Neve Shalom. I have Palestinian and Israeli friends and they expect me to march.
However I will not march in London against the war. The reason is that inspite of my opposition, I feel highly uncomfortable amongst the demonstrating crowd, for it appears somewhat suspect to me. The burning of the Israeli flag as quoted here at end of a London demonstration and the atmosphere of unidirectional violence are just confirming this.

Were I in Tel Aviv, I would instantly join in, but here in Europe other factors are preventing me to go. The problem is that I don’t understand what mobilizes people to march especially and every time it involves the Israeli / Palestinian problem and how the damage and terror imposed onto my Jewish friends in Israel is belittled and marginalised.
There is of course a difference if somebody is terrorised and another is killed, if one side has a hand full of dead and the other 100s, but there seems to be something in the opinion out there that suggests that Hamas somehow was right sending rockets on an almost constant basis (except the fragile ceasefire of a few months before the recent war eruption) onto Israeli towns across the border. Supposedly it is OK because Israel was and still is an occupying or controlling force.
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Ed note: I did go on a demonstration two weeks later, convinced of some of the debates in the comment section. However my suspicions were unfortunately reconfirmed on that demonstration, leading to yet another debate on Liberal Conspiracy (here) on the merits of SWP let Peace demos.