In my opinion, this (very popular!) line of reasoning is missing the forest for the trees. A knife is widely regarded as a tool that's legal to own and that, s

In my opinion, this (very popular!) line of reasoning is missing the forest for the trees. A knife is widely regarded as a tool that's legal to own and that, save a few precautions, you can carry with you. Switchblades, despite being also knives, are widely considered dangerous and their sale and possession is overall restricted (presumably) due to a strong correlation between the presence of a switchblade and stabbings. Just because SMTP and Tornado are protocols it doesn't mean they are the same - one is a protocol enabling a wide range of activities (some of them criminal, some not) while the other is literally designed to hide the origin of money, an activity that most governments frown upon.