Nobody gets in trouble for searching for and reading about anthrax and chemical delivery systems. But if your ex-wife dies of anthrax poisoning six months later, you will certainly need to have a pretty air-tight alibi to escape suspicion.

The FUD here around "omg if you search for something weird because you're smarter than average the jack-booted Gestapo will arrest you forever!!" is ridiculous.

No. If you don't have an average IQ, adhere strictly to what the government considers "normal"; you should be put under surveillance immediately and maybe "locked out of society" for being potentially dangerous.