Simple, the "father" of free software and primary open source license, Stallman, claims his "ultimate goal" is to wipe proprietary software off the earth. Add to that his radical supporters who constantly twist the truth like we see on this very thread, and some serious questions and opposition naturally emerge.
The "daddy" of closed source software got his start by stealing computer time at Harvard. He only avoided expulsion and jail time because his father (a corporate IP lawyer) sent lots of money to Harvard.
Everything since has been one theft after another.
There was commiting fraud on IBM by selling something that he didn't have.
There was stealing code from Stac software.
I could go on.
So, as long as you want to make the argument about who's daddy is more evil, you better clean up your own back yard first.
Begone, foul troll.
Here is what Stallman actually said about his motivations for GNU.
His statements don't seem at all anti-capitalist in bent, but very pro-freedom, and fully intending to promote the intention of the Founders in increasing human knowledge through LIMITED patent and copyright rights. The man is unquestionably utopian in bent, but I don't see him as intending an end to capitalism through GNU at all, just moving to the idea of a "post-scarcity world." And even were his aims anti-capitalist, he will not end capitalism simply throught distribution of free software.