I'm really sorry - it's been a heavy day and I am tired, so perhaps I am not reading your post clearly - but I find it contradictory and inconsistent. You say you like the post then postulate a lot of things in direct opposition to it.
Do you not believe that all living beings, creatures et al are interconnected? If not, then you will probably not be able to understand the logic of joining with others in order to build effectual power.
I am hazarding a guess that you have perhaps not ever been exceedingly ill. If that happens to you, the first thing you will discover is that those ihighly trained magickal instincts, concentration, sustained visualisation and clearly directed Will are the first casualties. This is not a speculation. It's a fact. Speak to terminal patients if you need to learn more (carefully). Whilst the desire to heal and recover may remain strong and unwavering, the human spirit is more easily dulled by degenerating disease than you might imagine when you have no experience of it.
I'll not waste my time on commenting about healing without consent - I do not think I could have been more clear in the original post.
I think your view of why people become ill is perhaps too finite. There are a million reasons for illness....some are the result of self-fulfilling prophesies or actions - but many - perhaps most are not. We are not born victims of our circumstance - we choose to become victim as one of several options available to us - no more is the sick person entirely "responsible" for their illness than is the bigot, the ignorant nor the fool of their blights. We are born into the circumstances that best teach us what we need to learn. It is our choice to decide if we do or do not. And I am much too old to spend my time standing in judgement on the choices people make.
As for your final question - the teacher can only teach when the student is willing to learn. Otherwise they must simply paper over the cracks until the student develops the depth of insight to relegate the ego to the "useful tool" drawer and determines that learning from somebody else's experience and wisdom saves them a great deal of time and fruitless effort.
I have paste and paper......