We would need to know the area in which the four lived if we think it could be Hanta.
This county is an upscale financial area in most places but this is a large county so we do have plenty of rural areas where rats could live.
I have said before the county is the most conservative county in Texas per capita - it would be hard to find a Democrat liberal living here. You won't find a single Democrat in any office in this county, so there won't be any blaming of white people or rich people for causing these deaths. What you will find, is, as soon as county officials find out what this is, if anything in the county, such as a rural place where diseased rats are found is the problem, it will be stomped out immediately.
Mice carry hantavirus too, not just rats. You don’t have to be poor to get a mouse in the house, and the further you live out of town, the more they seem to try to invade in the fall.