Interest rates being near 0% would create the most easily predictable risk of a calamity from investing in long-term bonds. Where else do interest rates go? Going negative is not likely to happen for long.

Furthermore, the bond yield was inverted for quite some time (indicating a financial tsunami was on the way) making it even more idiotic to be in long-term treasuries.

Also, building walls against physical forces is a terrible analogy for pressing a button to change your bond ladder risk.