Taiwan’s parliament, dominated by the China-friendly opposition, on Tuesday amended a controversial law to expand the lawmakers’ investigative powers, which opponents have slammed as an erosion of democracy. Outside the parliament building, more than 30,000 protesters showed their outrage by giving the move the thumbs-down. Protesters said the amendment’s passage would hinder the normal functioning of the government under new President Lai Ching-te of the independence-leaning Democratic Progressive Party (DPP), who took office last week, and create chilling effects on Taiwan’s democracy. In Ta…