Because of bitcoin does not give public details of people who make transaction with it, some people do say it promote crime. People needs to understand one of the features of bitcoin is freedom that anybody can get access to it, it does not discriminate. The privacy features of bitcoin is very important to humanity, which I know one of its advantage is for safety by using cryptography that makes all transactions safe and encrypted.
Privacy in transactions of bitcoin is much important, if their was no privacy it would have cause several criminal attacks. For those who think bitcoin encourages crime because of hiding public data of users don't understand the importance of bitcoin being private. Before bitcoin started existing monetary crime have been existing. Bitcoin is not a reason for monetary crime, bitcoin is just for everyone and does not discriminate but accept everyone.
Sure Bitcoin has nothing to do with the crime that's for sure, I mean yes bitcoin has been used or related to the illegal transaction but that doesn't really mean Bitcoin is related or something illegal or it is something that is a scam. Bitcoin in its nature just is decentralized which anyone can use and take advantage of that as well as having an anonymous transaction which is probably why it is getting connected to laundering or illegal transactions.
I don't believe its promotes crime at all, that statement doesn't really make any sense at all, It's just how the structure of Bitcoin works, and yes you can use it on any transaction, which is just similar to fiat money, Does fiat promote crimes? I don't think so, it is just a tool that you can use as well and can be used as well on illegal transactions or crimes beside it is really used on a lot of crimes. So I completely agree with you that Bitcoin is just for everyone but its not a reason for a crime.