Sarasi1, please be so kind as to post for all to see the Quranic verse or verses meaning: "The Qur’an says it is not permissible to attack those who do not attack you, nor to oppress those who do not oppress you." 

I urge you to begin your research with Al-Mizan's exegesis of 2:190, 8:39 & 9:29.  None of those verses mentions, directly or in adjacent context, prior attack. 

Further research should include Reliance o9.8, Risala Ch. 30.2(b) and Hedaya 2.144 all of which state the requirement of proceeding attack with dawah.  
Dispute this with facts if you are able: 5:33 provides hudd for 'wage war against Allah'; undefined Ibn Kathir defines it to include 'disbelief'. Which is confirmed by Hedaya 2.141's marginal note 'attacked without provocation.' I cordially invite you to challenge me on any of my blogs.