Is there a risk of criminal responsibility for lawyers to fight civil lawsuits?

No, lawyers can only speak from the perspective of benefiting their clients. But if you provide forged evidence, it won't work. You can make inferences in favor of the parties without evidence, which is ok. You can also put forward your own views on some evidence. However, even if you don't talk about the specific amount that can be determined by some words, it will not pass in the cross-examination stage, which will embarrass you at most and not be a crime.