AOG
You wrote:
"That is not on the spot where he was butchered, on your reasoning perhaps it would have also been in order just to erect a memorial to Stephen Lawrence in his mother's home town, all the way over in far off Jamaica?"
We, who have been on AB a while now, are fully aware of your feelings about the Lawrence family, but it would be wise not to allow your enmity cloud your reasoning.
Lee Rigby has a memorial in his mother's home town, because that's where he grew up. When I read that a memorial had been established in Lyn Rigby's hometown, my immediate assumption was that this was where Lee grew up.
It is.
However, I agree that a memorial should be created in Woolwich. And yes there is every chance that vandals may attack it, as they have down with the Stephen Lawrence memorial (it's now been attacked twice). It's sad that we have to even consider the probability of vandalism, but it happens. Putting up a CCTV camera to monitor the memorial will offer it some degree of protection.