Generally, helping personalities enjoy seeing others do well.
They have an active desire to help others.
A subtle problem with this desire is if the helper is dealing with a narcissist (or worse), fulfilling the desire to help will also involve fulfilling the narcissist’s dark need for people to attend to them.
This is an example of why we must be careful about positive moral feelings in ourselves.
Such feelings probably will not be filed in the mind as “positive moral feelings.” Rather, they might be filed simply as “good feelings” or “relationship satisfaction.”
The narcissist (or worse) feeds off the helper’s good moral instincts to maintain a dead-end desire, a low desire.
You can see this in subcultures as well. Like malignant narcissists, some subcultures will destroy, even seek to destroy, the larger culture that hosts them. They do this for pleasure and/or because it seems to them to be to their advantage.
Buddhist morality is always based on wisdom, on conducting a wise analysis of yourself and any situation.
It is good to be a helping type. But you have to be careful who you help. You really need to analyze it.
If you help a malignant narcissist because it feels right and because you are blinded to their condition by your moral feelings, you are not doing any good. You are probably causing harm.
At the very least, your positive moral feelings are being wasted. Beyond that, a more deserving person is not receiving your help. And beyond that, the narcissist is being strengthened and confirmed in their ways while a ripple effect from all of this goes outward.