Stop the Cuts - National Demonstration

Why do so many of them have scarves hoods and balaclavas and then fail to use them?

Learn from the police. They keep their visors down throughout. They also wear uniform which helps to hide their individual characteristics. Some of the students are wearing distinctive clothes as well. Very silly. Clearly they did not go there to cause a riot or they would have been more careful. Best bet is to wear black. A snood or similar over the lower face and head. Hood up. Dark glasses. Gloves. Boots. Reversible jackets can be a good idea.

or just protest peacefully?

*not defending the police!