Bitcoin is not perfect and so is every other innovation man has created.
Not perfect in the sense that it has pros and it also has cons.
"Bitcoin transaction is irreversible". I would have loved it to be, but there are reasons why it's not. Also, a transaction that was made from one bank account to another is irreversible too. So it's not new.
It depends on who. What is not perfect to you may be perfect to someone else. Irreversibility can be a feature, you may not see this until you can relate how it favored you.
"Bitcoin is used to commit crimes". (The lamest).
So does the Internet, phones, computers, guns, and all. Even harmless things like vehicles, boats, and ships are used to commit crimes.
Terrorism has always been funded with fiat currencies since before the inception of Bitcoin. You can walk into a bank and withdraw $10k cash from your account and you do not know if the money was deposited into the bank by a human trafficker.
I don't see anybody fighting fiat because it's used to fund terrorism.
Exactly! I do not see why you mention this too because it isn't tied to Bitcoin. As you said, these evil acts existed before the creation of Bitcoin, hence it isn't about Bitcoin but about us humans. And considering that anyone can use Bitcoin, we expect that different people with different opinions and intentions will use it differently, like anyone can use a penknife