If you have the space and it doesn't bother you I'd keep the literature. Watchtower use certain propaganda tactics but they are not the only ones who use those methods. However they tend to be the most pitifully transparent in the use of those tactics as you only have to hold up what the Bible actually says to see right through them.
If someone is willing to digitalize it, it may prove useful.
I have used images of articles in my YouTubes to show that an article exists, remind people of what it looked like and then highlight how Watchtower is using that contrary to the spirit and semantics in the Bible.