Darkcoin is more like electronic cash than Bitcoin - thats it.
If people could stop banging on about using it for dodgy activities that would be a start. Just shup up about your drugs - nobody cares what you do with your money. Thats the point.
Ok, that might be true.
Just frightening to think about selling and buying humans, organs, drugs etc. with Darkcoin on the internet, not to mention all the scams that will be easily pulled off with Darkcoin.
I understand your concerns about the impression that anonymity is reltated to illegality. Yes, people who are doing things illegally prefer not to be traced - that is pretty clear to everyone.
What might not be so clear to everyone is that there are many other reason to remain anonymous. Do you shred your credit card statements, or just throw them away? Why is it better to shred them? Because people could use the information in something like that (or a bank statement) to steal your money or identity. Or to "buy meth".
A block chain is very close to being a credit card or bank statement - it is a list of transactions that you (and in the case of the blockchain, everyone else) have made.
A better question might be "Why wouldn't you want an anonymous blockchain?