Ouch. Bit of a loaded assumption there, lol. Unfortunately I don't have the ability to get out very often and had mistimed my trip to the bank with having both kids after school when they were tired and fed up. However my personal circumstances are such that I cannot always manage to do things when they are at school.
Both of them were disciplined and lost activities for their misbehaviour, however it's important bills are paid and I cannot put that sort of thing on hold because my children are taking advantage of my being in a public place to act up.
The point was that they wanted to go home, not come with me while I ran two errands that should have taken me half an hour, and my son was acting up telling me he'd stop if I took them home.
It's really inconvenient for everyone when he was screeching on the bus and in the bank, yes, but you would think that most people would understand that kids misbehave sometimes, the squealing was in reaction to discipline and my not giving in to their demands.
I'm perhaps more used to blocking out their noise as my DD has some behavioural issues, I do generally apologise if people are visible disconcerted by it, and as I said, I don't let them get in the way as much as can be helped, but yes I do ignore the behaviour and hope others do too. He's attention seeking for a reason.