People get caught up in their own nonsense, or the nonsense which they have received and integrated into their thinking, that they begin to start making logical fallacies. In this case, false dichotomy, or categorising something in terms of a or b, when in fact there are multiple ways of categorising it and it is dependent on the individual.
The reason why the occult is out with the dishwater today is because you have people, usually half-baked witches who know next to nothing about real magic, writing books and using words which they provide no definition for. If we looked at older books on magic written by the real greats you will find that they define everything. Why? Because they realised magic is an individual subject and that one term can mean something very different to another person.
Dark magic/black magic is no exception to this rule. What one person views as evil is not universally viewed as evil. Good, evil, right, or wrong are all subjective constructs either created y the individual or inserted into their being via socialisation.
So this "Magic has no colour, it is just intent" is truly a broken record. Yes, it's true, but people have been using the terms of colour for over a century, and why they should stop is beyond me so long as they explain. The only reason it's disliked on this site is because someone probably raised an issue and everyone else wanted to lick their boots and appease the crowd. That's usually the case on this site, one member who is perceived as (rather than actually being) knowledgeable , says something and the sheep follow.