The content of the idea is superfluous. The point is that if you give the government the ability to tell people what packets they can and cannot send, then you're implicitly trusting that they won't abuse this power in the future and decide that there are other things people can and cannot send.
You're avoiding the question. Your claim is that making DDoS attacks illegal infringes upon your right to freedom of speech. My question to you is, since freedom of speech is the freedom to express ideas, what idea does performing a DDoS attack express?
