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If you make prank phone calls (even blocking caller ID), the phone company can be made to hand over your phone number & details

I don't think this should be the norm (you can't normally get somebody phoning you named), but i don't see why the internet should be any different.

or to meme it up for you:
Libellous comment is libellous
Threatening comment is threatening
Harassing comment is harassing

There are many things that are dangerous in this world. Cars, for instance, are numerous times more dangerous to me than any dog, and I speak as someone who has been attacked by a large and dangerous dog as a child. I would never call for a ban on either of those, but they do not necessarily invade the rights of others. Pesticides, too, can perhaps be used in a way that doesn't cause all of those nasty chemicals to pollute someone else's property. Until it crosses the border from one person's property to the next, it's OK in my book.

But if you want to walk around with dangerous dogs that can attack me

I don't want you walking around with a dangerous tool of rape tucked in your trousers. You could rape me any time!

Note the quotes around "vicious"? That's because breeds are not inherently vicious, individuals are. Banning certain breeds is neither necessary to eliminate all dangerous dogs (because within any dog breed, there will be well-behaved, friendly dogs), nor is it sufficient (because within any dog breed, there will be mistreated, dangerous dogs). If you speak to a knowledgeable dog owner or breeder, they will tell you that upbringing and environment matters far more than genetics in determining whether a dog will be dangerous/vicious. If you ban certain breeds, you'll be needlessly banning many friendly dogs, and you won't be addressing dangerous dogs of other breeds. If you want to legislate your freedom against dangerous dogs, use a sensible definition of "dangerous", rather than an arbitrary one such as "dogs of the following breeds: ..." If a dog attacks someone without reasonable provocation (as determined by a criminal court), have the dog euthanized, fine the owner, even jail the owner if it can be shown that the owner was responsible due to deliberate actions or gross negligence. In severe cases where an owner is a repeat offender, maybe even prohibit that person from ever owning or being responsible for a dog again. But ban a breed just because the misinformed public believes they are more likely to be vicious? No.

Just to pre-empt some of the expected rebuttals, yes certain dog breeds are responsible for a greater share of dog attacks than others, even after controlling for the number of such dogs in a given area. But banning those breeds won't solve the problem, or even alleviate it in a meaningful way for more than a year or two (time enough for people to acquire another puppy and then train/abuse it into becoming dangerous). Repeat after me: correlation is not causation. The reason those dogs are involved in more attacks is -- get this -- because people think they are more vicious! If you were the sort of person who wants to have a vicious guard dog (which you won't train properly, or might even abuse in order to encourage viciousness), you're going to want a dog that will be perceived by others as big, strong, and dangerous, because that makes a more effective guard dog. It doesn't matter if the dog has any tendency towards viciousness or not, if the dog is anything less than perfectly trusting of strangers, you can make the dog vicious. And then that breed will have more than its fair share of vicious dogs, not because the breed trends that way inherently, but because people who want a vicious dog trend towards buying those breeds! If you ban that breed, it won't stop them from getting a dog and making it dangerous, they'll just do it with a different breed with appropriate characteristics (physically strong, reasonably or highly intelligent, having a strong pack/family sense, and a tendency to be protective of their pack/family -- all positive characteristics in a properly-trained dog). Of course, if enough people pick the same breeds based on those characteristics, then those breeds will gain a reputation for being vicious and get added to the list of banned breeds, rinse, repeat.