Doc may be advising you well though when he says you may not be doing 'yourself' any good, it's hard to judge what an individual should do in these circumstances (I imagine you feel aggrieved at being excluded from your children by the Family courts, like the rest of us). It is a fact that whatever you or I may feel, the law is based on the views/decisions of those in power, who can claim that it reflects the wider communities views, those who elected them.
If people were prepared to turn out in your capital city en masse, then it might help, but I suspect it will be very hard to organise mass protests over injustices in Family law. The best turn out anyone has managed in the UK is a few hundred, possibly up to around a thousand in London, even after high profile stunts to raise publicity (I'm speaking of Fathers 4 Justice members climbing on the Buckingham Palace balcony etc.). I think many thousands would be necessary as a turnout to effect change.
There are many reasons why it is difficult to persuade people to protest. Alot of fathers bury their feelings of injustice, especially if they have a new relationship or second family to consider. Most of us feel beaten down by the system, as is the intention of it all, and are left to indulge ourselves advising others as our only outlet. How many times have you been told to "move on" or that your children will come back to you when they are grown up (true in 50% of cases only I'm told). All this is done to ease the consciences of those who support our current law (if they have consciences when everyone appears so brainwashed by the mantra "it's all done in the child's best interests").
Good luck whatever you decide to do concerning your one man protest.
ATB, Graham