How?
How can that possibly be hard to justify for anyone that even believes vaguely in the notion of freedom, much less someone "hardline"?
Do you think I break the law (or ethics) if I take the ads insert out of a newspaper I buy without reading them? How about if I hire a secretary to do so?
> This third party tool is making unauthorized edits to the New York Times' copyrighted material.
At the request of the first party (you) after receipt by the first party. They're not packaging it up and reselling it, they're automating your curation of a work you legally own a copy of for the purposes of your own consumption.
> You do not have a right to anybody else's IP.
Then the NYT should stop giving it away free.