I see what you mean. It’s not directly connected I see. Only indirectly via electrical pump as you pointed out.
It is curious that no flaps or spoilers were deployed. Maybe the control was not as great as it appeared. The plane did touch down a long way down the runway.
When I look at his background. 19 years of military service at the sharp end, does not leave a person “fully whole”. The US also has a history of neglecting the mental health of its service members.
This suicide might have more to do with those factors, than politics. The apparent political statement might just have been a final cry for attention.