Why would you not get that? That seems like such a stupid risk not to get that.

Pretty much for all the reasons I said in my comment - you'll almost certainly spend more on premiums for travel insurance than you'll ever claim (this is true of all insurance) and the expenses incurred by self-insuring are generally manageable. Even in the two situations you refer to, we're "only" talking about costs of a few thousand, and both of those are highly unlikely events that most people go their whole lives not dealing with. you're much better off putting the money you'd spend on that travel insurance into an emergency fund to cover those kinds of unexpected expenses.

Insurance is only a good financial call if you risk completely bankrupting yourself by not having insurance, otherwise you're just trading potential lump sum costs for small continuous costs, and the premiums will generally always wind up being more than what you're saving (because if they weren't, then the Insurance companies wouldn't be making so much money).

That being said, it's your money, if you'd rather accept that you're paying more over a lifetime on travel insurance than you're saving just to have the peace of mind that you won't have to dip into savings for any incident that happens before or during the trip (assuming your incident doesn't fall under one of the many carefully crafted exclusions that the insurance companies add to their policies to prevent paying out, which it probably will), then by all means, buy it - but if you're buying it because you think it's the financially savy move, and you have at least a few grand in your bank account for emergencies, then you're kidding yourself.