OK, I'll explain it in terms a fourth grader would understand: ALM means All Lives Matter, a phrase used by Trumplicans in response to BLM, a phrase, poorly worded, that means Black Lives Matter, too. However, when Covid19 appeared in the U.S., these same Trumplicans decided that it was better for some to Die for the Dow than they wear a mask to protect others (that's the primary purpose of wearing a mask) and "social distancing," another act to primarily protect others. Since older people and even younger ones with co-morbidities, are especially susceptible to succumbing to the virus, they were more at risk when the Trumpsters refused to wear masks and do social-distancing Therefore, ALM really didn't matter all that much to those previously spouting this since it meant that they had to change their routines, slightly, so that all lives, even those of the elderly or those whose health made them specifically at risk, were protected.
Do you understand now what anyone who wanted to understand it obviously could and did?