There was no need to continue their (Devaki's and Vasudeva's) ill feeling toward Kamsa. Thus they accepted Kamsa's words

Expressions researched:
"there was no need to continue their ill feeling toward Kaṁsa. Thus they accepted Kaṁsa's words"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

Because the Lord had already taken birth, just like a human child, and was in the safe custody of Yaśodā, everything was happening according to plan, and there was no need to continue their ill feeling toward Kaṁsa. Thus they accepted Kaṁsa's words.

SB 10.4.25, Translation and Purport

When Devakī saw her brother actually repentant while explaining ordained events, she was relieved of all anger. Similarly, Vasudeva was also free from anger. Smiling, he spoke to Kaṁsa as follows.

Devakī and Vasudeva, both highly elevated personalities, accepted the truth presented by Kaṁsa that everything is ordained by providence. According to the prophecy, Kaṁsa would be killed by the eighth child of Devakī. Therefore, Vasudeva and Devakī saw that behind all these incidents was a great plan devised by the Supreme Personality of Godhead. Because the Lord had already taken birth, just like a human child, and was in the safe custody of Yaśodā, everything was happening according to plan, and there was no need to continue their ill feeling toward Kaṁsa. Thus they accepted Kaṁsa's words.