TL:DR Plurblurs dumb, just remember you influence anyone who uses this as an introduction to the interesting world of the darknetmarkets.
Drugs have been shipped through the mail since before the internet was even a concept. The police have been working on it forever. The only thing new about the markets is that now the everyday joe can go online and order without needed to know someone in the game. The markets will always be on surveillance ever since the days of The Farmers Market.
The only danger of this subreddit is that anyone on the internet can come to the biggest site on the Internet and find out how to use these sites. This means that kids, the computer illiterate, and people who don't want to do their research can get on here and start ordering.
From my limited viewing this sub is all about harm reduction, I respect that. However, remember that this is the FRONTPAGE of the internet, don't forget to help your new community members. Ignore plurblur he just didn't do his research and keep being an awesome community :)
Sadly, you bring up a good point about kids being able to access the markets easily nowadays, I don't want to generalize about a young teenager's knowledge on harm reduction or drug interactions, as I don't know if any are taking the time to read up before using their product. I don't know any high school kids. My main concern are parents as that is something that I can generalize about. Parents can be worse than the damn government and once one parent forms a cause that "affects the children", other parents will rally behind them. All it is going to take is one high school student having a medical emergency due to whatever he did with a DNM purchase and the effect on the Darknet community will be undeniable. There was even a parent last year who turned in her son (13 or 14) after she intercepted his purchase. Now that tells you what the mentality of some parents is.