Don't forget all of the harm Captain America has caused. Cap's decision to "protect" Bucky by hiding the fact that Barnes killed the Starks from Tony directly led to the destruction of the Avengers, which in turn facilitated Thanos' acquisition of the Infinity Stones. Cap allowed himself to be deceived by Zemo, who made sure that Bucky was programmed to tell Cap about the five frozen "super-soldiers" in Siberia. That caused Cap to drag Scott Lang and Hawkeye into the debacle in Germany. That misadventure leads to them being incarcerated in the Raft, separated from their families and eventually with criminal records and home detention. Wanda and Sam also ended up imprisoned and later on the run for years due to Cap's bad leadership. Tony offered to help bring Bucky in as peacefully as possible and get him psychological help, remember, but Cap rejected that, ostensibly because Tony had Wanda on lockdown. But Tony was obviously protecting Wanda from Ross and international outrage over the incident in Nigeria which was Cap's fault. Cap could have ended all the controversy over Wanda's powers by going before the public and admitting that it was his inaction that allowed Crossbones to detonate his bomb and that Wanda had actually saved more people on the ground than died in the explosion. He didn't admit his guilt. of course, leaving Wanda to twist in the wind. The battle in Germany and the imprisonment Cap's team was all for naught because, of course, he had followed info planted by Zemo to lead him and Stark to Siberia. Most of the Avengers were already jailed criminals by that point, and Zemo's revelation of Barnes' assassination of the Starks dealt the final blow to the team. Zemo achieved his goal, the destruction of the Avengers, and universe's only real hope of stopping Thanos was destroyed along with the team. Tony fought to save the Avengers because he knew a threat like Thanos was on the way, but Steve was willing to destroy the team in his obsessive desire to keep Bucky safe. Tl;dr: If Cap had not insisted on disassembling the Avengers, the team would have been together and possibly able to stop Thanos.