Indeed, the concept of self-esteem is approached since then in humanistic psychology as an inalienable right for every person, summarized in the following sentence:

Every human being, with no exception, for the mere fact to be it, is worthy of unconditional respect of everybody else; he deserves to esteem himself and to be esteemed. Measurement
Self-esteem is typically assessed using self-report inventories. One of the most widely used instruments, the Rosenberg self-esteem scale (RSES) is a 10-item self-esteem scale score that requires participants to indicate their level of agreement with a series of statements about themselves. An alternative measure, the Coopersmith Inventory uses a 50-question battery over a variety of topics and asks subjects whether they rate someone as similar or dissimilar to themselves. If a subjects answers demonstrate solid self-regard, the scale regards them as well adjusted. If those answers reveal some inner shame, it considers them to be prone to social deviance.Implicit measures of self-esteem began to be used in the 1980s. These rely on indirect measures of cognitive processing thought to be linked to implicit self-esteem, including the name letter task (or initial preference task) and the Implicit Association Task.Such indirect measures are designed to reduce awareness of the process of assessment. When using them to assess implicit self-esteem, psychologists apply self-relevant stimuli to the participant and then measure how quickly a person identifies positive or negative stimuli.
The frontostriatal pathway connects the medial prefrontal cortex, which deals with self-knowledge, to the ventral striatum, which deals with feelings of motivation and reward. Stronger anatomical pathways are correlated with higher long-term self-esteem, while stronger functional connectivity is correlated with higher short-term self-esteem. Criticism and controversy
The American psychologist Albert Ellis criticized on numerous occasions the concept of self-esteem as essentially self-defeating and ultimately destructive. Although acknowledging the human propensity and tendency to ego rating as innate, he has critiqued the philosophy of self-esteem as unrealistic, illogical and self- and socially destructive – often doing more harm than good. Questioning the foundations and usefulness of generalized ego strength, he has claimed that self-esteem is based on arbitrary definitional premises, and overgeneralized, perfectionistic and grandiose thinking. Acknowledging that rating and valuing behaviors and characteristics is functional and even necessary, he sees rating and valuing human beings totality and total selves as irrational and unethical. The healthier alternative to self-esteem according to him is unconditional self-acceptance and unconditional other-acceptance. Rational Emotive Behavior Therapy is a psychotherapy based on this approach. "There seem to be only two clearly demonstrated benefits of high self-esteem....First, it increases initiative, probably because it lends confidence. People with high self-esteem are more willing to act on their beliefs, to stand up for what they believe in, to approach others, to risk new undertakings. (This unfortunately includes being extra willing to do stupid or destructive things, even when everyone else advises against them.