Yes, my ex had anger issues. He ended up committing suicide 4 months before his 30th birthday. I don’t think the diabetes helped his problems. I did notice there were often correlations between low blood sugar and outbursts...shortly after he died, I read that diabetics had higher levels of depression than the GP.
However, one of my coworkers is diabetic and as mild mannered as they come, so there is no excuse.
Diabetics can manage their disease by avoiding sugar and alcohol, and if the condition is advanced, they must monitor their blood levels, and may be required to take insulin injections.
The disease is not contagious, so is not a threat to the general public, if the person(s) suffering from the disease perform simple, basic dietary countermeasures.
A diabetic person can not safely consume sugar sweetened and/or alcohol laden beverages.