No, it never was. It was practical. Once Voyager destroyed one of the Borg's primary transwarp hubs and their Unicomplex, then for the first time, the Federation struck a genuinely damaging blow to the entire Collective, rather than just the occasional isolated, replaceable drone or cube. (And that was only a year after liberating the Unimatrix Zero drones and causing significant losses to their drone supply.) At that point, the Federation ceased to be a curiosity or a nuisance and graduated to an existential threat. Escalating their response to eliminate that threat before it did any more crippling damage was not personal; it was a logical calculation.