Alan, you're quite right, of course, when you bring up the past excesses of police action in crowd control.
There's even an argument that since there was relatively little in the way of destroyed property and crowd violence/injury that the tactics were pretty successful.
That said, I think my opposition comes from the observation that if the strategy is to wear people down
through attrition, making them think that if they protest they'll likely be trapped for hours without access to toilets, food and water - if there is a long term strategy to undermine protest itself, then we're talking about an attempted erosion of a pretty important piece of our democratic tradition.
I'm not saying that that definitely
is the strategy, but I don't think its too conspiratorial to suggest it, especially when taken into account with recent anti-terror legislation and restrictions on protest imposed by recent statute.
Back to Ian Tomlinson - I hope people don't attempt to make him a martyr of their respected causes. It looks like a case of police brutality on a guy minding his own business, and attempting to speak for the dead is plain wrong. IMO.
By the way, I should say that the last time I went on a demo it was against the criminal justice bill circa '93. And it got very, very hairy. Nothing like what I witnessed last week - whether that was because or in spite of policing tactics, I've no idea.