AP Photo

Violent protests across Egypt marking the second anniversary of the Tahrir Square uprising underline the depth of the crisis confronting the unpopular Muslim Brotherhood regime led by President Mohammed Morsi. After two years of turmoil, the government of the Arab world's most influential nation -- one pivotal to Middle East peace -- is having an uphill battle to assert its authority and re-establish public order, and for that Mr Morsi and his Islamist colleagues have only themselves to blame.