It's hard to have sympathy for the second homers as they're probably not struggling to raise kids in a cramped flat with no outside space and anti social neighbours.
They're probably going from a nice house to a really nice house.
If by some twist of reality someone was trying to escape said cramped flat with kids then I'd have sympathy.
It's hard for some people to comprehend what city lockdown is like. It's not just having to walk in a less pretty woodland instead of the beach. It's walking on pavements for the foreseeable.
(And don't believe the media hype, the vast majority of Londoners are complying with lockdown).