I feel anyone with a hard science background could make a device, which is part of the rationale of ethics and philosophy being in the curriculum. We do so much how we forget to discuss “should.”
It only takes about a tenth grade level of understanding physics and chemistry to make a decent device from scratch. With the access Americans have to over the counter explosives (tannerite) and arduinos you only need enough of an education to know how to copy and paste code. Relying on people being uneducated isn’t a good strategy because these things are extremely easy to make. I work with some people that I question whether or not they can read who build effective devices with little to no effort.
How would you know?
What makes you think it’s difficult? There are entire telegram channels dedicated to teaching future, wannabe terrorists, you can find them yourself if you want.
It’s been a threat for several decades and has only gotten easier and more sophisticated rather than more difficult.
A reasonably safe, fairly effective pipe bomb is easy to make with the some basic theory and high school chemistry knowledge. A moderately safe, highly effective pipe bomb requires only slightly more knowledge and a deeper understanding of high school chemistry. This stuff was easy enough that people were using it over half a thousand years ago to good effect. If you can’t figure it out now with a couple weeks effort and the breadth of knowledge at our disposal, that’s on you.