Because OP, as a traumatised anxiety-prone mother of children with autism, wants to wake up in a relaxed environment knowing that they aren't in immediate danger. That is the first thing they have pointed out with this entire thread. They mentioned having a hotel near an embassy, and probably know a few things about how transport links get completely ruined during a disaster.
I want their family to be safe and if it takes them another 40 minutes to get in, that's alright? I think the main thing with autism is overstimulation and if there's a lot going on, it can't help your anxiety, either. So I also picked a more relaxed area.
If they're spending a lot of money getting to London, I'd rather they spend their money on tickets for Wicked, West End Shows and visits to the Natural History Museum. I know that there's that southeastern service in which is fairly reliable straight to Victoria, so OP and kids are happy with that connection. Forest Hill was just a place on a map, but it's got a nice Overground link I also suggested Beckenham, Crystal Palace etc, but they're all really close to one another.
When you've been in like, real danger you don't want to be in anywhere near a place that could have real danger. I class OP being a victim of a terrorist attack previously just that, so I'm respecting their feelings to the absolute maximum.
I engage with people in real life (who happen to be minorities) all the time, asking them how their days are; the weather; the news; and the economy if we get on; say 'thanks for the coffee we're just in from XXX will be nice to see you later in the week for breakfast!' Chances are you'll most likely strike up a converastion if you're carting kids around, no matter where you are on this planet.
I'd hardly classify that as an interview.
As for the minority comment, I also have membership. We just have different views on it.