And it was precisely the Avengers' pursuit that let Thanos know Earth still had a group of resisters who had not given up. So Thanos came to Earth and killed all the remaining Avengers except Bruce Banner, including Tony Stark and Ant-Man, who had not joined the earlier hunt for him.
That turn of events was undoubtedly a tremendous blow to Earth. Even though Thanos had not directly slaughtered everyone on the planet, his two descents upon Earth still filled Earthlings with enormous fear.
Especially since Thanos had no intention of hiding the massacre of Tony Stark and the others. Many people had, in fact, seen images of Tony Stark and the others dying miserably.
Even Tony Stark was dead. Even the Avengers had been wiped out. Who else could possibly stop Thanos's attacks? Even if the Official Agencies stepped forward to calm the public, it had no effect at all, because the Official Agencies' credibility was already low, and the ability they had displayed was even worse. How could anyone be willing to believe them?
Bruce Banner, however, had been lucky enough to survive Thanos's attack this time. It was not because Bruce Banner was stronger, but because Bruce Banner had never shown up at the time.
The Bruce Banner of this universe had gone through more complicated experiences than the Bruce Banner in Robet's universe, and he had been through more as well. He had once left Earth for outer space because of humanity's rejection of him, and settled on Sakaar, becoming the king of gladiators under Sakaar's Grandmaster.
It was not until Thor and Loki mistakenly entered Sakaar one after another that Bruce Banner left Sakaar with Thor, returned to Asgard, and resolved the family affairs between Thor, Loki, and Hela. Only, Asgard also perished together with