Sharon/Steve
The US government hired on a lot of Nazi scientists in Operation Paperclip. That's why we were in the predicament we ended up in. Maybe that betrayal goes back further than Grant Ward, but he was our personal connection with it. When you've counted on someone to have your back, and then you find out they had it just so they could win brownie points to destroy you down the line? A lot of people can't forgive that.
Don't mistake me, HYDRA did a lot more damage than just giving us Grant Ward. Unfortunately, we're all stuck in a place where we can't go after the bigger wigs.
It wasn't SHIELD. It was HYDRA and Alexander Pierce that made you a fugitive. The rest of us attempted to figure out why. Some of us even questioned that decision to Pierce's face.