The UN is not objective. They keep repeating the "peaceful protests" thing, but what sort of peaceful protests would aim to take down the president by force ? I'm not an Assad supporter but come on, we saw how that peaceful protests ended up in Libya; France was doing air strike to stop the Libya government to interrupt the protests, people killed their former leader with their bare hands.
The only peaceful end during the Arab spring was in Tunisia as their former president escaped in the beginning. A coalition of western countries took over their country to "establish democracy", and now Tunisian people are letting Europe teach them how to be a democracy. It's not free of course. I met bunch of Danish people getting paid really well for working for Tunisian government, as a part of the transition.
Syria was a failure for whoever organized Arab spring. Assad gave a CNN interview in the beginning of the war, saying that he'll lead the transition to democracy. But, he'll fight whoever choose violence. Whoever organized those protests already wanted a war, so it didn't matter what Assad said. Please go back to 2011 editions of your favorite western papers and look at the news about Syria, reporters based in London were hysterically telling people about how peaceful protesters in Syria are being killed by a demon, Assad. Same propaganda machine most recently made campaigns about a group called White Helmets, founded by James Le Mesurier, a well known MI6 agent.
I traveled three times during the war to the Turkey - Syrian border, volunteered in the refugee camps there. There was not even one UN tent although every year they make big promises such as water pipeline, schools, etc. If you look at UNCHR website, you'll see they are asking money for regions where they don't even report from because they got no volunteers there at all. Later, I traveled to other middle eastern countries around Syria and met chance to meet UN volunteers, told them my observation about their operation. They explained me how they basically count victims and collect money. They bring an NBA or Hollywood star to one of the camps in either Iraq or Lebanon, take some photos and fill the pockets with millions of money that will be spent in 5 star hotels, business class flight tickets, western bars and restaurants in the wealthy neighborhoods of poor middle eastern towns.
If you're looking for truth, don't expect these corrupt organizations to tell you, do some research. Who was the US foreign minister during arab spring, who has been backing his/her political campaigns ? If you find this name, all you need is to research that person and find out what he has been organizing "peaceful protests that turn to violent" all over the world, from Ukraina to Egypt, from Libya to Syria.