Actually, we need a little more context to understand his thoughts, and for that we need to wait for more updates.
The new adventurer agreed to go with them to the A-rank dungeon, provided that the witch, whom the local adventurers know a lot about, was present. She seems to be popular in these parts because of her origins and great talent.
Gordok would not go to a low-level dungeon; he is interested in a bigger catch. Why does he want to go with the witch? Their group broke away from the main clan, and there are new rules, new codes, and so on. He and his guys don't despise witches. Gordok is young, so he didn't live through the times when witches were persecuted. As already mentioned, the war ended about 20 years ago, and after that, everything changed.
The main character understands Mia's pain regarding the persecution of witches. The Wandering Swords are a popular clan that persecuted witches, but this is precisely what presents a great opportunity for Mia. It is an attempt to clear the reputation not only of Mia herself, but also of other witches. The rumour that once bitter enemies are now in the same group, working together for the common good, may help the people finally realise that witches are no longer a danger to society.
Going to their camp is a big risk, but it is also a great opportunity. The main character is confident in Mia's strength, as mentioned when they met the leader. They also know about her strength, as Mia is a popular adventurer and almost the only powerful mage in the province.
Tara is also a very strong fighter. In case of danger, she is able to transform into her DD form and calmly defend herself, as was also shown in the game. The main character knows about her abilities and is definitely not worried about the potential danger. The only one who could suffer in all this turmoil is the main character himself. But he is capable of finding the courage to take risks for Mia's sake.
Some points were mentioned in passing, but more time is needed to fully explore the topic.
Many things in this text may sound strange. SORRY!! I am using a translator