Three red cards - are referees getting tough at this World Cup?

Three players were sent off in the World Cup opener as Mexico beat South Africa 2-0. Are we about to see a World Cup littered with red cards?

from BBC News https://www.bbc.com/sport/football/articles/cjwglq2gzd6o?at_medium=RSS&at_campaign=rss
via TV Aerials Oldham on Google