At first the Antisec movement seemed very childish. After reading weev's discussion about it there seems to me more depth to it.
If you're interested you can read the discussion
HERE(A member of antisec discussess with an opposer about the ideas and goals of antisec)
For those less interested this portion below, is a short breakdown written by weev. It's not as clear and explanatory as if you had read the preceeding discussion, but it's something.
"...The antisec philosophy is quite simple. I can break into into powerpoint style bullet points:
1) Hacking is about breaking into networks without permission. Any whitehat attempts at turning it into some socially "beneficial" pursuit are a vile attempt at meme poisoning. Hackers develop tools and techniques intended to break into networks and systems. Hackers USE those tools. They do not publicize ways to prevent their use or sell them to the highest bidder.
2) The corporate oligarchy at large collected their assets in manners that are unethical. It does nothing but abuse the wealth and power it has stolen. It has no right to its holdings and hackers have a moral obligation to take what they can from it.
3) The first-world governments (most notably the United States government) are corrupt feudalistic shitholes that have long abandoned any notion of civil rights or free markets and need to be destroyed.
4) Based on points 2 and 3, the only honorable thing to do is assist in the damage to the corporate oligarchy and first-world governments. Anyone that is acting to assist them is part of the problem. Hacking is about ruination and destruction, Kali and Shiva, the angry vengeful God of the old testament, etc."