If only there was some way of, I don't know, tethering your animal to you so that in didn't run off uncontrollably at the first whiff of someone else's food. Radical I know, it'll never catch on.
Its the **** litter *everywhere* that makes it a real problem, so in the rare event of taking them anywhere where people picnic I have the joy of them pulling rubbish,plastic packaging, nappies and human shit out of the undergrowth.
If I see a picnic mine go on the lead as 1 of them was regularly fed by picnickers when he was younger so he has learnt to sit by a picnic and look hungry, and the other was also starved to death and then dumped by her previous owners so has a bit of a thing about food.
Also if someone yelled at me about my dog sniffing their abandoned bag, I think I would just laugh at them tbh; as I would think they were a bit special.