In fact, Thanos's thoughts were right. Although the Infinity Stones were not things those cosmic civilizations and special races cared much about, they absolutely did not want Thanos to obtain them.
However, they absolutely did not want Thanos to obtain the Infinity Stones.
In fact, whether it was the Xandar Empire, the Kree Empire, or the other major empires, they all knew that Thanos possessed the Mind Stone.
But they also knew that the people controlled by Thanos had already reached his limit.
A single Infinity Stone—and one that was the Mind Stone at that—did not pose much of a threat.
All the civilizations also understood that the greatest threat among them was the Power Stone. The Power Stone could destroy an entire planet by itself, and it was a disaster for any civilization.
However, no one could use the Infinity Stones. If one was merely embedded in a weapon, its abilities would be greatly restricted.
At the same time, the Power Stone's might was far too powerful and could easily affect its user, making every potential user wary.
Moreover, the Power Stone had never appeared in the universe, and no one knew anything about it.
Thanos had not wanted anything to go wrong. He had intended to secretly obtain the Power Stone, but Leo had become an unexpected factor.
That was what made Thanos realize something was wrong. It was not until he truly encountered Leo that he noticed his original plan had completely changed.
Otherwise, according to Thanos's plan, as long as he found the Soul Stone, his speed would be enough to settle everything within half a day.
He would have been so fast that those Thanos feared would not even have time to react before he finished.
That was how it happened in the original story.