Ick.
If I wouldn't buy it for me then I certainly wouldn't let the kids have it.
That said, if I'm eating something then I can't refuse it to them IYKWIM? Kind of hypocritical IMO.
We have a good varied diet that usually doesn't involve much rubbish, but I often see parents who say oh my kid has no rubbish to eat, but will happily chow down on some Maccas themselves.