Being able to use the web anonymously is a value that should be held up against moral values. Malicious scraping of websites should be, too. Both ideas can simultaneously true, they don't have to be mutually exclusive. I also support initiatives like the web archive which I consider "good behavior" of web scraping.
If a person asks me for the dataset of my website and they don't have a competitive business that they run, I'm even happy to open source the dataset generation part. Contributors get more rights, abusers get less rights. That's how it should be in my opinion.
I don't see them as contradictory.