system
Given the following post, respond as if you're commenting on Reddit:
human
[Sherlock Holmes] Why isn't MI6 all over the Holmes brothers?

Doesn't anyone find weird that one of the Holmes brothers is a genius independent detective and the other is a high ranking official in the british government?

What if these two are up to something? They have the perfect setup to cover all kinds of operations such as international spionage.

If i were MI6, i wouldn't let Sherlock grab a sandwich without agents following him. Much less get involved in solving criminal cases where he doesn't answer to anybody but himself.

And it would be a good idea to keep tabs on Mycroft as well, he could compromise national security in his meetings with Sherlock.
gpt
Who's to say Mycroft isn't the head of MI6? His job is completely undefined, we just know he's essential to the government of the U.K. 

Head of MI6 fills that requirement, he clearly works in a shadowy spy like way, has a lot of connections, an extensive network of people working for him.