Aldrin was frustrated because more bodies were found, and all of them were of omegas. He was so angry, it was clear someone was killing these weak wolves.
Though omegas were weak, they still were the most important part of the packs cause they were the reason for stability.
So, every pack loved and cherish these wolves. If there are no omegas, how will a pack go on?
Even if they had all the best or strong wolves in the pack, the purpose of having the pack was to protect the weak. Whoever was killing the omegas was making a statement and was cruel.
So, his anger was reasonable. He had been receiving calls after calls from packs across the world. They were all reporting the same thing.
He was in a tight spot. He had no idea what was happening. So, he ordered all the packs to call back their omegas and protect them.
Wherever the omegas went, they must be accompanied by someone stronger than them.