Can you expand on that? GM claims they took those cars back because they didn't sell well and so GM couldn't/wouldn't commit to providing spare parts and repairs into the future. Lessees countered by offering to release GM from such obligations and handle the repairs themselves but GM refused that offer. But why? It's not as though they might have set a dangerous precedent by allowing EV1 lessees-turned-owners to repair their own cars, since buying out car leases and third party repairs were already normal aspects of the car industry. GM were fine with this generally but in this specific case they refused to allow it.
To me it seems like some GM executives hated having been required by California into making the EV1 in the first place and wanted to destroy all of the cars for some feeling of satisfaction and finality. Pure spite in other words. Maaybe GM were egged on by oil companies who wanted to crush the spirits of people who thought electric cars were viable, but the oil company angle doesn't really seem necessary to explain what happened, unless you believe GM wouldn't make a decision like this out of pure spite.