Eliminating the undesirables is a phrase often associated with negative connotations. To rephrase it in a more positive light, we can use synonyms such as eradicating the unwanted, removing the unnecessary, or purging the undesirable elements. Another way to express it could be to eliminate the non-essential, deselect the undesirable, or eliminate the redundant. It is important to choose words that do not offend or marginalize any group of people, as this phrase has often been used in a discriminatory manner. By using neutral and positive language, we can communicate effectively without causing harm or negative reactions.