The phrase "understandable reasons" means having logical or valid explanations for why something happened or why someone did something. Full definition
Other clubs go out and conduct their managerial search for understandable reasons in that way. (arsenal.com)
Even though we may feel guilty about or regret actions in our past, there were probably understandable reasons why we did what we did; even when we were cruel or selfish. (phawellness.com)
We understand that some clinics don't like to give out discounts for a variety of understandable reasons. (lifelearn.com)