[EM] serious strategy problem in Condorcet, but not in IRV?

[James Green-Armytage]

Dave:
>>       B's backers can claim a legitimate goal - A is the worst enemy, so
>>they should do their best to help A lose.
>>
>>       A's backers can claim a similar goal - B and C are equally
>good/bad,
>>so they should be neutral as to B vs C.

Eric:
>
>A legitimate goal can never involve the subversion of voting process.

Myself (James):
I agree with Eric here, in that the B voters are doing is definitely
illigitimate and devious, and shouldn't be tolerated, if it is possible to
stop it.
I have to sympathize with the A voters, however, as they are only trying
to defend their rightfully-winning favorite candidate against an unfair
loss. Also, they never order-reverse, but only truncate.
Still, it is a little hard to figure out where to draw the line.