These are good points - pollution, eye sore, blind spots, etc. I try to be really careful with it and be aware of my surroundings as much as possible. As far as the neighbors are concerned, I weighed purchasing the fire truck that I'd always wanted against possibly pissing off the neighbors. The rest of that story is history.
Of course should be allowed to own the truck, but I'd have a problem with him parking it visibly and operating it regularly in a residential neighborhood.
Attracting children is a good one I hadn't thought of.
As for visibility, I think that probably cancels out with a responsible driver. The fact that it's harder to drive will engender additional caution, for probably no major net change in danger, assuming he can avoid getting so used to the thing that he gets sloppy.
It also would have far worse visibility than a Ford Explorer.
That said, I don't think it is an argument for whether he should be "allowed" to have the truck or not. If there was evidence that people with large truck always hurt kids, perhaps; but I don't think that evidence exists.