Sure, you still need to look after yourself in the moment - but there are incentives in place to discourage drivers from misbehaving and those incentives do help reduce the likelihood that you will be a victim of an accident. They’re not great! Bad drivers get away with a lot, and cyclists are not adequately considered in many mechanisms, but they are better than nothing.
Yet ‘nothing’ is what we have with respect to online fraud, where the situation is more akin to one where driving laws don’t exist or aren’t enforced, nobody drives cars with license plates, you can’t get insurance, and if you are run off the road the police’s reaction is to tell you that roads are inherently dangerous places. Bad drivers will never be caught, and if they drive over you they get to steal your bike and sell it. Entire businesses are set up around forcing cyclists into streets where they can be mowed down with steamrollers, and the police claim to be powerless to stop them.
There are numerous mechanisms that exist that make it possible for us to share roads without inherent trust. And even those are inadequate. Fraudulent behavior online has none of the societal mechanisms that we have created to constrain driving.
This mind set means that anyone on the roads or on the sea should never assume or trust any other participants, and thus to the best of a person ability communicate intend, verify that everyone is behaving correctly, and apply a defensive posture in order to create margins against unwanted outcomes.
I am a firm believer that commuters and pedestrians Urban Asia are suffering from PTSD just by going from point A to point B.
I failed my driving test in the US twice because I kept stopping at green lights. Back home, if you don't do that, you'll die or kill someone.
This is why driving schools teach defensive driving. You can't control anyone else but yourself.
Rather off-topic, but it's funny how this principle applies in the exact same way when it comes to traffic for instance. It is unfortunate it has to be like that, but not trusting any other traffic and assuming they can at any point do the thing you'd least expect them to do is just safer. Especially when e.g. cycling this saved my from injuries or worse more than just a couple of times. And that's even in a country with relatively high numbers of cyclists.