Life has several of those; blurry lines are, metaphorically, sides or limits of any given situation that cannot be clearly distunguished or told apart (and hence cannot be morally weighted decisively either).
In today's rant I bring you a very common blurry line:
Vice vs. habit.
Now let's try to understand what is going on here.
A vice is often defined as something that is either morally degrading to an individual or harmful in any given way; a very prohibitive and restraining connotation as you can easily infer. Habit on the other hand is something commonly defined simply as something executed with a degree of constancy.
Now out of those two, it would normally be said that vices are "bsd" and habits are "normal". That's exactly where the blurry line is, and its blurry exactly because its distance to either side will vary to accomodate one's needs.
A simple example should suffice.
Coffee is commonly seen as a habit and its socially accepted as such far and wide, but a more careful inspection of such matter could also describte it as a vice - caffeine is a neuro stymulant that will speed up synaptic interactions for a given period, to do so it alters the brain chemstry to make use of it, in essence it acts no different than a drug on a purely chemical level, and despite that no one will accuse you of being a junkie or send you to a rehab because of coffee.
It should be important to note that I am not partial to the use of drugs or anything like that; to whoever uses them, it is both a vice and a habit - or better yet, its a vice because it became a habit, and its habitual because of addiction, so its a complementary contradiction at best, and that is the point I'm trying to get across, and just that, what others do with their bodies and lives is not my responsability.
Lastly as I stated above, the linear distances depend on the person, and so does the judgement made by each, which brings the final point of this rant to light - anthropologists say humans are a social race, that's naivette at best - life will be always be weighted, measured, seen and lived inside each of our own carcasses, whether we like it or not, each human's life is essentially individual as coexistence will force all sorts of concessions. which in turn makes each of us become more and more unnatural to their essences; as a result, society is artificial and inauthentic at best.