Comments made in season 3 make it clear Giles is consistently warning Willow off.
Giles cautioned Willow against being overly ambitious and restricted some of the darker/more dangerous texts, but he didn't forbid her from doing magic except for the times he wanted her to do magic', for the most part he let it be known that he disapproved and left it at that.
Not that Willow took any of his disapproval seriously, besides at this stage she's doing smoke spells and minor telekinesis, having had the wherewithal not to try necromacy (again) when it goes wrong or the time/dimensional stuff with Anya.
It's only when she's fully away from anything approaching supervision- not to mention being a legal adult- she she starts going off the rails.
Oz's comments in Fear, Itself show his general respons
Oz is super-supportive and promises to back her decisions whatever, he just says to be careful because of his own fears of losing control.
The only times she intentionally ignored the safety of others was in Smashed and Wrecked which I have always felt were OOC
You forgot all the times she got spells wrong, other people got hurt, and nobody held her to account so she did them again the next year. So, nope, she doesn't hold herself to any kind of magical- casting safety standard un til S7 when she's worried about losing control.
is someone expecting a lot of a person while denying them the tools to fulfill those things.
Holding somebody to a consistent moral standard whilst also advising caution but also not demanding that Willow push herself and do difficult spells? None of that is contradictory, its all rather complimentary, and incredibly mild given what Willow's friends actually do.
I mean, they forgive Willow trying to kill them multiple times and murder the world in a matter of...days of seeing her again.
Yeah, they're really holding her unreasonably accountable...
Most fans have actually encouraged Buffy to collect from her enemies, but also, do you really think it's a good idea to just leave a sword lying around on the ground?
Or how about maybe bring a magical weapon to the
Magic Box where stuff like that can be stored safely? Bare minimum competence is absent in S6.
I forgot to add, the same time Giles was saying WIllow shouldn't be casting magic because her emotions were messed up he was talking with Buffy about how Willow was recovering well, to the point Spike had to call them on how wrong they were, and waiting for her to cast a truth spell.
I took it to mean that Giles could perform the (relatively simple) spell, or at least they would cast it together. Giles says that Willow shouldn't be casting 'alone' right now because of unfocused energy. Plus the 'thy will be done' spell is way more powerful than a truth spell