Princess Twilight Sparkle! A princess lesson you shall now learn from us for future reference. To be fair, sometimes keeping a secret is important! It allows for the element of surprise and public safety!

Yes, but...Luna, lasers on the moon.

Now, now! While I am aware I should have mentioned it, this is not like the mirror, you see. The construction of the lasers was requested by popular demand, and duly recorded in the official minutes of the moonponys' periodical! 'Twas all perfectly legal!

...

Its not our fault the moonponies dislike most Equestrians and don't publish anything planetside!