Yes they do, obviously. But the reality is that many people are just not open to the idea of improvement beyond the bare minimum of minimums. US education is quite seemingly in a much better state then, many people get into the profession for all the wrong reasons, it was painfully obvious in my secondary years. - For reference, I've seen a teacher tell a student that they still get paid regardless of the result the student gets. As for my formal teaching, I've done several years of it in Higher Education, teaching anything from first year undergraduate students in my major, to teaching digital literacy and study skills, and on the other spectrum I've been involved with teaching digital skills to NEET. I have several certifications relating to the topics I teach, and 2 qualifications relating to education. Neither of these are relevant to the topic
The reality of the situation; regardless of whether you believe it to be the case or not (or whether you adhere to it), is that many people are woefully concerned with their time, both how they use it, and who they use it on. People want smooth duties, if they can help people along the way, then by all means, but the reality is this won't always be something that'll show in your duty. To take an example for myself, back in Heavenward someone was asking me why I wasn't using Bane on AoE packs (yes I know). When people are trying to blitz through these duties reading the tooltip and immediately putting it into execution on a routine basis just isn't happening in that dungeon, so I took the time, read the tooltip and facepalmed for an hour. Then in subsequent runs I started to use it until it naturally fit into muscle memory. Which need I might say took a few pulls. People at the time were equally pretty annoyed, and for obvious reasons.
The extent of me telling people not to teach is when they don't fully commit to it, either for that duty or whatever. It happens on a very regular basis. You cannot teach, expect people to immediately apply it then get frustrated when they don't. A lot of people in the community do this and are routinely upset by it and the general performance. I've reiterated several times that you only do so if you can commit and follow through without getting annoyed, because this is where stigmas and generalisations start that are detrimental to the community. Terms such as casual very quickly grow to have negative connotations. Equally so; it is unhealthy and unrealistic to expect that everyone can teach and is always doing so with the best of intentions in mind. If people want to teach by all means. But don't cry wolf when people don't learn within 10-15 minutes
Let me snag another example. If someone provides me with feedback, sure I'll be receptive to it and on the subsequent pulls I'll even try to apply it if I can, equally so for subsequent runs. This was a very commonplace thing to happen when I tried raiding in Eden's Verse. But if people, anyone does this and then bashes or berates the player for not meeting that expectation in a due timeframe, then the player very quickly becomes reluctant to forms of feedback. Why? Because to them they associate that experience with being berated. It has absolutely everything to do with intent. If you're trying to help and you're doing it with the goal of a faster or more efficient duty, you'll be woefully disappointed. If you try to help with the expectation that they'll learn fast; again, woefully disappointed. It is absolutely everything to do with intent and expectation, especially from the perspective of the one helping.
Again, I'm not personally attacking you, I'm just presenting you with logical reasons why not everyone should try, or why it can be detrimental to do so when you don't commit to the endeavour.