system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why did NASA keep us waiting before they revealed what they found on Mars?

It's not like they're a company coming out with a new product and they want to build up hype. They're a part of the government that works for the people. Why would they intentionally withhold information from the public for a period of time?
gpt
It takes time to vet the information a few more times. 

Then there is how do you share the info. Sure the could have just put a one page document out on the web, but they wanted to do everything to give the best context possible, so they gave news agencies time to coordinate for it, get the group of guys out there to discuss it.

NASA is also an agency fighting for funding, making sure everyone knows what is happening and putting them in the spotlight is a nice bonus to show they are still doing work.

And about your govt agency comment. NASA does not exist for the convenience of the public. Is the Motor Vehicle Agency open when it is best for you? No, they are open and working the hours which make it most economical for them to do the job assigned.