A lot of travelers think that everything will be ok but then again, someone can suffer from heart attack anywhere in the world. I think everyone can remember , tsunami hit a popular beach destination in Thailand in 2004. The tsunami also killed thousands of people in other parts of Asia.
When we travel to some places we hope we can safe. And when you combine this with health risks, the possibility of cancelled flights, and international immigration problems, the cost of travel insurance literally looks like pennies when compared to what you will spend otherwise. "Prevention is better than cure", the saying is applicable in this case because you certainly don't want to spend your lifetime savings for something that could have easily been covered by a travel insurance company.
I think travel insurance is important.