The stats on skull injury during MC crash without helmet tells the story. View a few YouTubes on bike crashes and you will start wearing a decent helmet. These days even the HD crowd are wearing full face buckets. Stats about MC crashes due to CT use are non existent.
Basic wear... gloves, thick jeans, a jacket with body armor and decent riding shoes. I still see no helmet or even eye protection, shorts and flip flops on motorcycles. Slow down. Ahhhh and avoid riding on wet roads and at night. Just saying.