I refuse to accept the view that mankind is so tragically bound to the starless midnight of racism and war that the bright daybreak of peace and brotherhood can never become a reality. - MLK
Bomb-making instructions don't kill people, people kill people.
1. You can't ban bomb making instructions in such a method that it would be effective. Other countries (believe it or not) also have the internet, and can host sites. Additionally, there does not exist the kind of oversight infrastructure that could scan the entire internet to make sure that no one has left bomb making instructions (say) in a note entitled "why i love kittens" on their facebook page.
2. Once you've accepted the lack of capability on the part of government to censor the interwebz (China puts large amounts of resources into this.... and fails), the low-cost high-yield solution becomes obvious.
“If we must have an enemy at the head of Government, let it be one whom we can oppose, and for whom we are not responsible, who will not involve our party in the disgrace of his foolish and bad measures.”
- Alexander Hamilton. Spiritual father of #NeverTrump