1. I'd think if I stop and offer to pick them up, they might think I'm a potential pedophile/kidnapper. So I'm reticent.
2. They would think, as they likely have been trained, if they put out a hand and ask for a lift it might be be a kidnapper.
Somehow we have conditioned ourselves and our children in the space of maybe 40 years to think the absolute worst is likely when the reality it is actually quite rare.
(I'm in Australia)