The fellow looting to the left is likely part of Estonia's 1/3 ethnic Russian minority. There have been riots in this small, typically frozen and usually safe/mellow country recently owing to the removal of a World War II monument to Soviet soldiers and the disinterment of some of their remains. So far one person has been killed.
I've been to that monument, having done a short period of contract work in Tallinn, the capital, back in 1999. It's a strange and incredible little corner of Europe. The old town is a thousand years old and a UNESCO World Heritage Site. It "looks like Europe" more than anywhere else I've been.
The issue has brought a number of uncomfortable social forces to a head. A lot of ethnic Estonians sided with the Nazis during the war. There were thousand year old ties with Germany, and frankly the average Estonian, who is related to Finns, probably thought of themselves as better people than your average Russian. Many still do. When the Soviets kicked the Nazis out of the Baltics, they incorporated the Baltic States into the USSR whether people liked or not. (For the most part "not.")
Ethnic Russians moved to the port cities of Estonia, which shares a border with western Russia, and although a minority everyone had to learn Russian to get ahead in school and in careers. Resentment ran high. When the USSR fell apart, about a third of Estonia became an ethnic minority overnight. Laws were changed to make Estonian the official language and the language of school and commerce. Suddenly the Russians became disadvantaged, and ended up with the crappier work and salaries. I noticed that my Estonian phrasebook wasn't always useful; there's a good chance that your bus driver or waitress speaks Russian.
Now we come to deciding to remove a monument to the people who liberated Estonia from the Nazis... and incorporated the country under Soviet/Russian control. You can understand how the mutual resentment has boiled over.
Hopefully this will blow over at some point, and you can visit this cool little country some day soon when the tear gas clouds dissipate.