I presume from showing something they've worked hard to discover and research. Even if their work may be used maliciously, it's better to be out in the open so that our communications systems can be made more robust, than to leave it in the dark to be exploited at a later date for nefarious and/or strategic reasons.

For an example, see the bricking of Viasat's satellite internet terminals in and around Ukraine at the onset of the Russian invasion of Ukraine as part of the greater Russo-Ukrainian war[1]. If someone had discovered that vulnerability before, and been "happy" to present it, perhaps it could have been avoided.

This kind of security research into structures and services that millions of people rely on every day is of utmost importance to keep our society safe from malicious actors.

[1]https://www.reuters.com/world/europe/exclusive-us-spy-agency...

Because they did a hard thing and made it public which strengthens us over the long term?