The dark web is the World Wide Web content that exists on darknets, overlay networks which use the Internet but require specific software, configurations or authorization to access. The dark web forms a small part of the deep web, the part of the Web not indexed by search engines, although sometimes the term "deep web" is mistakenly used to refer specifically to the dark web.
Every affair in the dark web will use Bitcoin as a method of payment. In the dark web there are various illegal businesses such as the sale of illegal firearms, drug trafficking, assassins and hackers.
What are your thoughts on this Bitcoin abuse?
What abuse? If you really think that is abuse, then what do you think of the abuse on the fiat currencies that are used in buying and selling drugs, money laundering and other criminal operations?
Your thinking is flawed and Bitcoin, if used wisely, is the perfect tool for "criminals" who want to operate outside of regulations.