It's sad to hear every time this happens, it's gutwrenching because you know survival's very unlikely. Anyone who's ridden a motorcycle or scooter knows how quickly it can go south. I believe it's both motorcycle and car drivers like Manuel and Nan said. The general ignorance of consequence and just complete lack of empathy is alarming. A lot of the guys on motorcycles drive like other vehicles on the road are somehow made of air or never going to hit them or, and this is new, under the constant obligation to get out of their way (think motorcycles having ambulance type right-of-way rules and truck horns to boot). The car/suv/pickup/bus drivers are like "if they don't care, we don't either, our vehicles protect us, if they are that stupid they deserve it". No amount of helmets or riding gear (which only touring type or foreign riders use) can completely save you from a crash and forget about hoping most drivers are looking out to protect you.