This is it, notice how Google Trends[1] shows a rise in “30 year old boomer” not long before “boomer shooter” becomes more commonplace. It’s just the whole applying “boomer” to things like being stuck in their ways or boomer-like behavior, rather than age, that took off a few years back.
[1] https://trends.google.com/trends/explore?date=all&geo=US&q=boomer shooter,30 year old boomer&hl=en
Subsidies are an incredible tool when used well, like when they funded a bunch of utility cooperatives that electrified rural US. Maybe you’re asking why we should because propping up the car industry when public transit and bike infrastructure should be subsidized instead, rather than challenging subsidies, though.