My general attitude towards web scraping is that if I, as a user, have access to a piece of data through a web browser, the site owners have no grounds to object to me using a different program to access the data, as long as I’m not putting more load on their servers than a user clicking all the links would.

Obviously, there may be legal repercussions for scraping, and you should follow such laws, but those laws seem absurd to me.