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Konoha would want Sasuke back, dead or alive anyways. Aside from Madara(which most people don't even know about), he's the sole user of the fearsome Sharingan. Having such a weapon roaming around wouldn't be in their best interest. We saw how fervently the village was for defending the Byakugan bloodline so I doubt they'd want to risk the Sharingan falling into enemy hands if they could try and stop it.
Same reason the elders didn't want Naruto roaming around basically.