Because people will always be needed who are skilled in picking up the pieces after an earthquake, volcanic eruption, social conflict, tsunami or major air crash. Such events need individuals who can organise help for survivors, make the area safe, draft in food, shelter and adequate water, arrange accommodation for relatives of dead/injured. This kind of job cannot be left to amateurs. It needs people who are slow to panic, compassionate, and intelligent, who are natural organisers and who can reassure both survivors and other rescuers but above all it needs people who know what they are doing. And for that you need training. Go for it. And good luck.