"If we don't who will?"
I don't think anyone is obligated to.
Not even the FD? They should never enter burning buildings? Never enter confined spaces with who knows what kind of atmosphere? Never enter rushing water? It is the FD's job to train and practice for these hazards. It is why they take the job and is their obligation!
Not even the PD? They should never pursue or approach an armed gunman? They should never engage in a firefight? Never taken down an assailant? They should turn and run?
Not even our armed forces? They should not do all that they do? They should not patrol roads with potential IEDs? Engage the enemy? All because they may get killed? They do what they do because it is part of the job!
There is an obligation and duty to act. It has absolutely nothing to do with fantasy, playing hero, or romanticizing. Fire/Rescue/EMS/Law Enforcement are dangerous jobs and you never know what situation you may find yourself in. That's why we train to be able to handle the situation and work through it.
A firefighter does not fight fire or search an apartment building engulfed in flames to be a hero. They do it because it is their job and obligation.
A cop doesn't pull his side arm and fire shots to be a hero. It is his/her job.
A Paramedic does not attempt to rescue a person entrapped in an auto or attempt to pull someone from a house fire to be a hero. They do it because it's their job and obligation.
A Marine does not engage the enemy to be a hero. They do it because it is their duty and their job.
RISKING YOUR SELF IS AN OBLIGATION AND PART OF THE JOB. YOU DO IT SAFELY, NOT BLINDLY AND IGNORANTLY. SOMETIMES WE DON'T ALL MAKE IT HOME AND THAT PART SUCKS. BUT WE SACRIFICE BECAUSE OF OUR LOVE FOR OUR FELLOW MAN AND STRIVE SO THAT THEY CAN LIVE AND CONTINUE WITH A FUTURE. JUST AS WE WOULD EXPECT THE SAME IN RETURN. IF YOUR IN A SITUATION WHERE YOUR GONNA DIE UNLESS SOMEONE ELSE PUTS THEMSELVES IN EQUAL DANGER, ARE YOU OKAY WITH THEM STANDING BY WATCHING YOU DIE? OR ARE YOU GONNA BE HOPING THEY HAVE THE TRAINING TO GET YOU OUT OF WHATEVER SITUATION YOUR IN?
ITS NOT ABOUT BEING A HERO. ITS ABOUT TAKING THE TRAINING AND SKILLS YOU WORKED YOUR *** OFF TO ACHIEVE AND PUTTING THEM TO USE TO SAVE ANOTHER'S LIFE.
As FireTender basically said, it's a calculated risk based on all information available at the time. We can only hope when its all said and done that the math adds up and we end up okay.
Has the world really turned that selfish where we no longer can support someone giving their all to aid another human being? Where we no longer expect our emergency services providers to put themselves in harms way to save another's life? That we just want to stand back and watch?
I would never ask someone to put themselves in a situation they are not trained to handle and have NEVER advocated that in this thread. Bottom line... if your trained, experienced, and based on your calculations you can carry out a safe rescue in spite of extreme hazards than you decide what your gonna do. Just don't tell someone else that they are foolish or stupid for putting forth the effort and skill to save someone else when the decision is of sound judgement based or training and professional experience.