That's not the crux of the argument. The crux is that Wood was motivated purely by revenge, knew that Spike had a soul and was different and wanted to kill him anyway. Not just kill him but fight him and satisfy his ego. Making him both wrong and a tool. Giles may have been thinking of group safety but as has been pointed out he was turning a blind eye to other threats in the house. He also went behind Buffy's back and seemingly had no plan in place for the events afterwards. Making him a bit of a hypocrite as well as wrong.
That's not cool. This place would be pretty dull if we all saw things the same way.
Well, I agree that Wood was wrong- he was motivated by revenge and wasn't thinking clearly. I agree.
Wood wanted to draw out the vengeance, unvent all that anger- I'm not sure it was an ego thing at all, but that really doesn't matter.
But the more I think about 'turning a blind eye to other threats' in the house the more I think its balony. There was no other threat at that time that even came close to trigger-happy Spike.
Willow- People forget that, more than anybody, Giles
knows that Willow is no longer a threat, he worked with the coven for months to ensure her rehabilitation, seeing her remorse, her struggle, her change.
He knows she's not the same person who killed those people- darkest magics notwithstanding.
Anya- Did Giles even know about Anya returning to vengeance. I don't even know- even so she'd helped him on several occassions since reverting to being human again Beljoxier's Eye (?) I think. Not a threat any longer.
Faith- Actually not even there yet, not a issue. But I would've accepted Giles being deeply wary of her when she showed, it just never comes up because they were all overtaken by events and Caleb.
Andrew- Not superpowered, not triggered, no where near the same level of potential threat as Spike. He's barely even a prisoner at this point but I admit he should've been tied up/slapped around a bit more by pretty much everybody.
Plus, Giles' plan? Eliminate the threat and convince Buffy that it was the right choice after the fact.
What was Buffy's plan? Cross her fingers and hope? Buffy had
no plan besides wailed 'but he has a soul now!'- ignoring the fact that Spike killed a dozen or so people while having that soul plus a chip- so clearly, having a soul has nothing to do with whether Spike was a threat or not.
It was Giles who came up with the 'cure' for the trigger, after all. He tried that plan, and it appeared to have failed. Giles, being proactive, tried something else.
Is it good that he failed? Well, yeah, because in the end Buffy's faith in Spike is sorta vindicated.
But the actual question is was it wrong that Giles tried what he did? No, it wasn't- he did what he thought was nessesary. That's the thing about Watchers and their training/personality. (you can see this with Wesley and what he did with Conner) they make the tough call because they think its right based on what they know at the time.
Giles doesn't do any of this lightly, and he knows that it will hurt Buffy because of her feelings for Spike, but ultimately he does it to safeguard her life and the lives of others in the house. I can't call foul on him for doing that, because I look at his motives.