I don't want to sound callous, but if you can't understand why level crossings are dangerous and what all the flashing lights and bells are about, there's no hope for you.
Manning all crossings would be expensive and inefficient. Sorry - better to let natural selection work its course here. At the end of the day, people have to take some responsibility for their own safety and if all reasonable steps are taken to warn, and these are not heeded, there's nothing more that can be done.