Techno is not the only form of music to have "divides", as was pointed out.

From experience i have found that this phenomenon occurs when there is a stagnation or a drop in punter interests. This causes a fierce competitivness between members of that particular community trying to voice who is better and hence deserves more attention.

What must be considered is the cause for the lack of interest or support that starts the symptoms of division.

Consider....

When Techno was at its peak there was no problem getting gigs or support from a venue/punters.
When things stagnated artistically the punters left and hence the venues too.
Now, if you mention the word Techno to a venue (at least here in Australia) you will not get much interest as the support from the punters has diminished.

It will take time and a fresh approach to put things back on track.