Everyday people with everyday computers or phones may not feel too strongly about computer security, and for their purposes they might even be right: the average personal computer is behind the person's router's firewall, and often isn't particularly interesting to hackers anyway: There isn't much valuable information there, which is why the risk is low...
If you want to plan a heist, you aim for a high value target. And hackers are no different. In the case of the solar winds hack, they went one step further though: rather than go for the high value targets directly, they went for the company providing all those targets with systems software...