Mark the Guntrader breach as Sensitive
The Guntrader breach should not be publicly visible as the severity of that leak comes from it revealing the names, addresses and locations of UK gun owners. Guntrader is a site that is purely used to buy and sell legal firearms in the UK so 99% of those with an account have guns. The UK National Crime Agency are involved at a high level as this breach puts gun owners at high risk of criminal attack and theft of firearms by knowing who has them and where. Unlike some countries the UK has very strictly controlled firearms access and guns and their locations are not normally available to most criminals. Currently you can search this site for an email address to see if they are a gun owner which is potentially as bad as the original leak. By cross referencing information from social media and other leaks a full picture of gun ownership is easy to put together. Alternatively allow opt out for individual breaches.
I did consider flagging it as sensitive, but there were insufficient reasons to exclude it from visibility. Further, Guntrader themselves don’t deem it necessary to hide the visibility of an email address on their service (see attachment).