My first thought when they showed Erik being nutso was, "Hmm, maybe fandom has underestimated what kind of issues Clint's been dealing with as well." My second thought was, "Well he came out from under Loki's control sooner and he's a trained agent and he got to blow stuff up." My third thought was, "Yeah but Clint actually killed/tried to kill people - his coworkers included - while under Loki's control and Selvig was just doing science stuff. My fourth thought was, "Okay but Selvig even seemed a little less-tightly wrapped during Avengers, going on about the Tesseract showing him things, whatever that's about." So basically I just had a lot of thoughts about those things.