Why does the Spellguard hold all knowledge of The Machine?

What is the Spellguard hiding from citizens of Lower?

The Machinist Guild wishes to bring knowledge of The Machine to ALL, so that the work of the lost gnomes can benefit ALL who live in Sanctuary.

If you wish to help Lower with an animatron answer, join The Machinist Guild.

Speak with Ichabod the Machinist or leave letters at The Crone.