They didn't seem terribly useful, compared to other long projects.

• Maintain humanity under 500,000,000 in perpetual balance with nature.
• Guide reproduction wisely – improving fitness and diversity.
• Unite humanity with a living new language.
• Rule passion – faith – tradition – and all things with tempered reason.
• Protect people and nations with fair laws and just courts.
• Let all nations rule internally resolving external disputes in a world court.
• Avoid petty laws and useless officials.
• Balance personal rights with social duties.
• Prize truth – beauty – love – seeking harmony with the infinite.
• Be not a cancer on the Earth – Leave room for nature – Leave room for nature.

Basically, a freethinker version of the Ten Commandments tablets.

Conspiracists attributed nefarious intent on these stones. I learned about them from a podcast that studies conspiratorial thinking. I didn't realize they'd been destroyed. I kinda think I heard that ep after the time when they were bombed, so maybe that was mentioned and I didn't internalize it.

Heads-up: conspiracy people are potentially dangerous. They blew up these stones that were probably pretty trivial / harmless. They have shot people for perceived great-replacement bullshit (synagogs). This shit isn't just amusing and stupid. They're irrational and they can project and cause harm.

They were quite likely put up by folks that believed the same wack job shit as those that destroyed them.

If they were meant to survive nuclear apocalypse, then why did one small non-nuclear bomb bring them down? You'd think they should be better constructed or protected or something.

Good riddance for probably wrong reasons. Shame they plan to rebuild this crap. Guidestones for thinly veiled eugenics and genocide, they were. Blergh.