I think the risk of motorcycle riding is mostly borne by the rider. If you think the reward outweighs the risk, you are welcome to ride. If you think it's too risky, you can decide to not ride. You have a great deal of control over your destiny. (There are many other risks, including risks to others, but we're ignoring those for this comment.)
The calculus of a pandemic is different. Your choices affect others, potentially exponentially. You can decide you're in a low risk group, and so you don't care if you get infected. So you do get infected, and like your risk analysis determined, are fine. But you also infected 3 more people thinking the same thing. They each infect more people. One of those people several "generations" away from you then receives an emergency phone call from the nursing home, and rush to go see grandma. They infect several people in the nursing home, and now people that didn't want to take the risk of getting COVID-19 so you could do something you wanted to get COVID-19 and die. When dealing with exponential growth, your small choices can explode into large consequences.
People don't do well with cause and effect that they are strongly removed from, and that's what we're seeing with calls to reopen. The negative effects of their behavior will never affect them, so their thought is to ignore it. People in charge of public health have to balance these externalities, and that's what they're trying to do. I am not saying that they made the right decision, but it still seems prudent to me to avoid unnecessary activities if it means you may save someone else's life. We did achieve some important goals in the 3 months that we've been shut down so far. We have better tests. We have better contact tracing. We have more PPE. We have taught people to socially distance. So we are certainly making progress towards being able to live more freely without increasing the risk to the most vulnerable. But we are not in the clear yet.