I don't think it is invading their privacy-with-a-big-P (after all I have no idea who these people are or where the lived etc), it is more just socially it felt inappropriate.
I think if a young family was sat on a park bench doing this and you went and sat on the bench between the mother and the father it would be considered at the least incredibly rude and inappropriate. Even if they are in a public place and you are not technically violating any laws, you'd still be acting in a way that most people would disagree with.
I think if a young family was sat on a park bench doing this and you went and sat on the bench between the mother and the father it would be considered at the least incredibly rude and inappropriate. Even if they are in a public place and you are not technically violating any laws, you'd still be acting in a way that most people would disagree with.
This is what it felt like to me.