"[..] and its almost exclusively a phenomena specific to the left..."

What about the KPD 1956 or the German Autumn then? This party and movement also represented

"a portion of the population"

that was excluded from polls or 'participation'.

The paradox of tolerance, the historical fragility of each rule of law, the separation of powers and the constitutional state ( 'Rechtstaat' ) render parties and movements whose alignment aim for the qualitative destruction of these markers of political entities built to survive more than one election as not just risks, but dangers to regional democracy.