The Internet represents a golden opportunity for civilization. But only if people use it responsibly. Mass, unsolicited e-mail is simply not responsible. If the use of spamming goes unchecked, it will quickly overwhelm the net. You have no right to fill people's e-mail boxes with your amazing offers.
Responsibility is the price of admission for using the Internet.
You must take responsibility for your own actions. You must consider the consequences of what you do, and refrain from doing harm to others or to the community as a whole. The list goes on and on. Not only is junk e-mail irresponsible and ineffective, there's simply no need to do it, because the alternatives are so much more appealing. Spamming is not a sustainable activity.