I think they care, just not in a way normal people would - for Trump voters, it’s 100% about trolling, annoying, hating, and secretly wishing dead anyone they deem to be the “outside group”. And the worse Trump gets, the louder will that outside group’s opposition to him be. Which in turn gives his followers great satisfaction. So they care in a negative way, along the lines of “the people we hate and want dead will be so outraged by his gaffes, the news will be soo delectable to watch tomorrow! I’ll come so hard watching them rage!!”