I have found the discourse to be very poor on all of stack exchange to the extent that I have banned its usage by my students The system is poorly designed with unhelpful people getting a lot of say Its a pity its a resource that could be useful
I have found the discourse to be very poor on all of stack exchange
If you don't like it, don't use it. I am sure the owner/operators will be willing to give you a full refund.
to the extent that I have banned its usage by my students
Isn't this a little like telling them not to watch channel 12 when they go home tonight? I presume you mean in your classroom, of course.
The system is poorly designed
I guess that's a subjective call. If I were in charge (which I am not), there are certainly some tweaks I would consider in consultation with my staff and the community -- which seems to be the way it is now, except for the part about me being in charge.
That said, as I've made an effort to explain recently on meta, SE is not the only "technical knowledge sharing" resource on the web; there are certainly many alternatives, and with regard to the Raspberry Pi, we are, realistically, not even the most significant -- as opposed to Stack Overflow, which at this point in internet history certainly is the most significant general programming resource, and trying to withhold that from your students I think will, in the end, simply teach them that being a teacher does not mean lacking excessive bias in one's field, etc.
I admit that I am often disappointed with the quality of discourse as well, however, I am also often disappointed with, e.g., the quality of discourse in representative democratic politics. In the latter case, I do think part of the problem is that "the system is poorly designed", but as an anti-Panglossian I think I ultimately agree with Voltaire's implicit premise that the human species is far from perfect and there are very unfortunate limitations to what can realistically be expected from it and its members.
Sorry I could not solve your problem for you.