Personally I can't feel guilty about it. Copyright was a compromise. A limited privilege of exclusive rights to encourage the creation of new works after which they would fall into the public domain and everyone would have full access to them.

Companies have gone back on their end of that bargain and now we have perpetual copyrights and new works will never enter the public domain. Deal broken, I feel no need to uphold my end by respecting the rights they were granted.

Sure. But it's not intellectually honest to justify downloading terabytes of the latest Hollywood blockbusters on the grounds that it's unfair that those downloads are treated the same as century-old texts. You're smuggling in an irrelevant grievance.