I have known a few people who acted, mostly in minor, local productions. Some actors find it easy to leave a character and move on to the next script, while other lose a little bit of themselves on each separate portrayal.
When you are in character, a tiny bit of your mind has to embrace the role, swallow it whole. There must be a sort of suspension of disbelief for a while. Some were never all that grounded to begin with, so, there isn’t much to compartmentalize.
Bottom line, yes, if actors could get mental counseling without thinking no one will offer them any more roles, then yes, they should have access to that counsel.
Many pro athletes have similar struggles, that they feel must remain hidden. Even if the age of Social Media overshare.
People who play the Joker have gone through issues.