As I said in another comment further down, Biden's reliability (i.e., his reliable self-restraint in comparison to some lunatics (I would imagine) in the defence department) may be being compromised by the effects of old age. However, the relative merits of Biden and Trump may be unimportant now as the next presidential race will almost certainly not be between these two. It seems to me that voting for the lesser evil can be a rational course in general, but Americans (a group to which I do not belong) will need to consider this on the merits of the case in 2024.