in Nazi Germany etc. the state would have ensured that both the speaker and audience were followers of the party line. No dissent would have been permitted. Dissent is healthy - it is in Israel where we are seeing attempts by the government and others to smother it.
Stabbing reported in Kiryat Gat in southern Israel (Haaretz)
from the article: Jewish leftists disrupt Kadima MK speech at U.S. University