If you want the impossible, then what’s involuntary is meaningless.
Say you want to fly by flapping your arms.
This means you are in an involuntarily situation, by definition 1, since you can’t do what you want.
Definition 1 | voluntary situation: a situation in which a person (or quasi-person) can do what they want the most.
(The definition is a simpler but equivalent version to the one found here.)
In your imagination, the set of possibilities is I = { (can fly), (cannot fly) } and your most preferred option is p = (can fly). However, you clearly live in a universe where the only options are: U = { (cannot fly) }.
As such, compared to your imagination, you can’t do what you want: p∉U.
You’re in an involuntary situation.
Clearly, however, this isn’t meaningful — there’s no point in comparing with the impossible.
You’re not meaningfully acting involuntarily if you want to have babies but don’t have a womb. (As asked by Monty Python: “Where’s the fetus going to gestate - you going to keep it in a box?”)
The same applies if you want to live on Mars or swim on the surface of the sun.
For someone to meaningfully be in a voluntary or involuntary situation, the reference must be realistic.
