If you're beginning to get the idea that planning and building a trail network involves a multitude of questions, compromises, competing interests, and protracted bureaucratic infighting, you begin to understand why they're difficult to bring into existence. A trail idea will not meet with universal acclaim. Quite the contrary, in fact. The NIMBYs, naysayers, and simple obstructionists show up at every public meeting. They can be quite vocal, and more importantly from the political classes point of view, they vote.But that's just the political and planning end. Even if you have a trail system, parents have to permit their children to use it. Given the "stranger danger" paranoia that infects so many parents, can we really expect them to let their kids ride a bicycle to school? There's a couple of interesting points here- the practical problems of dealing with lobby groups representing opposing interests and the battle against the propaganda of danger.