Are you to blame?
There was a post on the Bamboo bike frame, essentially saying "a disclaimer that this could be dangerous isn't enough; people aren't qualified to judge the strength of their homebuilt bike frames so might still get hurt even if they are careful", which attracted a lot of ire, but also a response from whiteoakart reframing the question, thus:
As a maker and writer of an Instructable, what is your responsibility to keep your readers safe? How far does your culpability extend?
This is obviously a knotty issue, and one that seems to have a range of attitudes across the board- some people say "pointy things are pointy, hot things are burny, don't hurt yourself" and leave it at that, some people list all the grievous injuries possible from their Instructable.
In my opinion, there are two major things to consider:
Is a person likely to do themselves harm even taking reasonable precautions?
- An Instructable on how to weld, with clear advice on breathing protection, eye protection and not electrocuting yourself should be "safe"
- An Instructable on free rock climbing, even with all the advice in the world about how to climb well, could easily get someone killed because free climbing is inherently dangerous
Both of these have an element of "reasonable" to them- if you make your instructions foolproof nature will give you a bigger fool, but there is a point at which it is reasonable to assume that a sensible person following your instructions with care and attention will not injure themselves.