With the Borg there is no possibility of reason.
Janeway managed to form a temporary alliance with them, granted they did turn on her once the Species 8472 threat was over, but it does show that under some circumstances the can be reasoned with.
It'll just come round and bite you in the backside though.
Commander Austin Harris, First Officer, Deep Space Nine (by FltCpt. Bossco)
8.01 - Darkest Before Dawn
(Chapter 8 added, 12/09/2015)