Knowledge is power. More specifically knowing more than others is power. If your organization expects to have a certain level of power over society that translates directly into having a certain knowledge gap to the general public.
The real question is why they would be obsessed with having their power in the form of knowledge instead of leveraging knowledge to more direct forms of power such a military, political, and financial.
I am guessing they are the conservative belt, suspenders and healthy dose of glue type of people. They have lots of conventional power behind the scenes that they actually use, but rely on superior technology as the hidden trump card to guarantee their power.
This would naturally lead to mind set their the public would be allowed only the direct of technology that is at least two steps of development from being able to challenge the tech the organization has access to. You can compare this to the old British policy of the Royal Navy being stronger than the next two fleets combined.
This way even if they need to use their technology they can use tools that pose no direct threat even if a hypothetical enemy gets access to it because they still have superior tech available.
This kind of mind set would have implications to how the organization works and operates, but that is really beyond the scope of this question.