I'm disappointed with one casino I'm supporting because their action is unreasonable and on how they address the accusation they hurdle against them.
Try investigate very well and see if the laid accusations are genuine or not, we have some that are just in expression of competitive fight against each other, then also go by what you have experienced with them than the rating you're receiving from other sources that could always counter them.
Do you think support should not attack the personality of the player and concentrate on the issue?
If it is confirmed to be genuine one why not, but this could be a long process to get the fact established that's why you see no much attention in this aspect.
Do you think casino management should get support with backgrounds in human relations and psychology to understand the action and behavior of the complainants and address it in a proper way?
It's a good idea as long as the intention for such is not contrary against the expected delivery and extent they should go with justification.
Do you think support can make or break the casino's reputation?
Not really, because this is a global platform everyone cones on board to gamble on a particular casino, they may try with attempts but it may not go far against the casino reputation since support does not alter the casino rating, online reviews, regulations, or any other legal authorization for the casino to operate with.