Look I'm as much "fuck cars" as the next guy but riding a motorcycle on a highway is unironically suicidal. I personally know a guy who got in a bad crash on one but miraculously survived; he had a year long recovery period but will have various pain and dysfunction in his body for the rest of his life. I also know some people who did pathology rotations (state medical examiner office, autopsy basically) and the big three categories of bodies coming in were drug overdoses, suicides, and motorcycle crashes.
One of the facebook comments links to a seventh person who died a few days before these on June 18th: https://www.fox13seattle.com/news/motorcyclist-killed-sr-530-crash.amp
If I think about my times visiting the Philippines, traffic is so congested in Manila and even the smaller towns, that motorcycles can't really Rev up to higher dangerous speeds.
And your other statement is correct, much fewer cars. Maybe some jeepneys, buses, and cargo trucks but no deranged private citizens zipping around in their Ford F-5000