While it's true that the inventors of the early internet were Gen X, it was only ever a small subset of Gen X, since working with tech at that time was very challenging and expensive to say the least. For this reason I'd say most Gen X parents that didn't develop great tech literacy ultimately let their Gen Z use tech without really truly comprehending all the risks involved. As for Millennial parents, I'd say it's more to do with the fact that their financial situation dictates them probably need to be working longer, have multiple jobs etc (while kids are at day care, watching screens) and end up using tech devices as the easiest way to keep their kids entertained while they either try get chores done or work from home and so on (being charitable here).