Loki just busting out with "Why would I respect Captain America?" during the cleanup after Avengers 1 but before he's gagged "That nation doesn't treat it's veteran warriors with any respect, and leaves those wounded in war to die of hunger on the streets each winter."
That gets Thor's full attention in the worst way possible and Tony starts talking about the Maria Stark foundation, but Loki just keep stirring the pot about veterans exposed to carcinogens during the Iraq war who can't afford medical care and the political games being played with their benefits package. Clint mentions Jon Stewart and Loki rips the rug out from under them by pointing out that a comedian private citizen from a stigmatized minority religion is the main advocate for something that a warrior culture like Asgard would get done without a single word of debate.
Thor wants to muzzle Loki, but he's distracted by a shouting match about the VFW and how many vets commit suicide so they aren't a burden on their families. Cap agrees completely with Loki and that feels really weird, but Loki's contained and there is a new cause he needs to fight for so he'll work through that later. When Sitwell and the other officials arrive the heavy hitters on the Avenger's team are all ready to spend some political capital on this issue while Loki's quietly explaining to some impressionable peon that he was coerced into acting as he did during the invasion by the owner of the army that attacked, and if they will keep him on earth a while he will happily tell them everything they want to know about Thanos. By the time Stark, Sitwell, and Natasha convince the rest of the team that they need to focus on more immediate issues Loki is already three-quarters of the way through negotiating with the CIA or FBI representatives to exchange the things he knows - both about Thanos and about advanced technology/magic - for a comfortable living arrangement and a full pardon.
