Comment by Eisenstein

Reductio ad Absurdum is not a fallacy but a legitimate rhetorical technique where you can point out obvious flaws in logic by taking that logic and applying it to something that people would find ridiculous. Note that this is not the most 'extreme' version, it is the same version, using the same logic.

Example:

Argument: People should be able to build whatever they want on their own property.

Reductio ad Absurdum position: I propose to build the world's largest Jenga tower next to your house.

Note that this does not take into account any counter arguments such as 'if it falls on me you will still be liable for negligence', but it makes a point without violating the logic of the original argument. To violate that logic would indeed be a straw man.