The thesis of humanistic theory has been supported by a number of studies that have shown that people are capable of great resilience and that they can overcome significant challenges in their lives. For example, one study found that people who had experienced childhood trauma were still able to develop healthy and productive lives. Another study found that people who were faced with life-threatening illnesses were still able to find meaning and purpose in their lives.
The thesis of humanistic theory has also been criticized by some researchers who argue that people are not always inherently good and that they can be destructive and harmful to others. However, the overwhelming majority of research supports the view that people are fundamentally good and have the potential to achieve great things.