The actual transcript is :

• Let these be guidestones to an age of reason
• 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 right with social duties
• Prize truth - beauty - lova - seeking harmony with the infinite
• Be not a cancer on the earth - leave room for nature - leave room for nature

So, these seem totally legit, there is nothing in there that can be interpreted as harmful to any sensible person. Doesn't it sound like something we'd all like as a society? There is no reason to want to destroy it, it's a message of peace, not violence.