True. But we don't value human suffering above everything.
This is why all known human cultures have had some form of soldiers who are ready to die to protect the tribe, the religion, the culture, the nation or what not... otherwise they wouldn't exist.
Not just that, we allow for risky occupations like mining, fishing etc. i.e. things we need for sustenance. We even allow for risky hobbies or sports i.e. just for entertainment.
These are clearly more important than "human suffering".
You wouldn't choose to die to prolong the lives of the few cells in your infected tooth. You'd remove the tooth instead. Similarly, you'd sacrifice yourself to protect the tribe, family, country etc. And the ecosystem would try to sacrifice you to protect the ecosystem if it comes to that.
This exact same argument could be used to dismiss human suffering as well.