Why was hitler angry about the inscription

Huntington's disease. It has been speculated that Hitler had Huntington's disease. When many of the physical symptoms shown in newsreels during his later life – his hand tremor and shuffling gait – are coupled with his alleged mental and psychological deterioration, they may also point toward Huntington's.

d.summerains, the last one

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.