SC is a mixed bag. Three big cities, rest is mostly rural. Incredibly red state. Education level is poor. Suffers from brain drain in most areas.
3 of my kids refuse to live here and are actively trying to leave (accountant, engineer, lawyer). Driving can be dangerous due to road conditions, lack of maintenance of vehicles, and ignorant/low education drivers.
Taxes are low, but public infrastructure matches the lack of investment. I can drive all day long between "big" cities and never see a state trooper. If not for tourism and the military bases, the state would be even more poor. The upstate got lucky with Michelin and then BMW.
Charleston suffered when the Navy shut down and has slowly recovered - and getting Boeing has been a big help.
Gangs are a problem in central SC due to lack of jobs, poor education, and easy access to drugs of all types. Kids shooting kids is unfortunately not uncommon here.
I stay because it's home and I know what to avoid. If I were moving in, I'd really research the areas - and go where the school district is the best (even if you have no kids). The rich gravitate toward the best schools, and that brings less crime and better shopping, eating establishments, etc.
I loved and lived the best part of the mixed bag you speak of. My impression of the state (and that of my wife and kids) is the opposite of your and your family.
We moved from Long Island NY to SC 16 years ago and loved it. My daughter started in SC first year middle school in one of the states highest rated public schools. Went on to Clemson University has a killer job now in Charlotte able to work from home and just bought (on her own) here first home in VA
My son, never much college material, almost a decade ago, now married with two kids works for BMW in the upstate. Call me crazy, he got married, bought his first home, wife doesnt have to work, now 2 kids, 2 BMWs AND just now, looking and can purchase at any time a brand new 4 to 5 BR 2 story style home being the 3BR ranch is closing in on them as far as room.
Sorry but SC offers these possibilities all over the state for those who want to work hard. Taxes are low, costs are low, you can find good school districts and I call it the land of the free, free to chose your destiny without government on your back.
Heck, you dont even have to get car inspections, nor to you need tags (plates) for your trailers.
Anyway, wish your kids luck, not every place is right for everyone but the bottom line is the state is one of the fastest growing in the nation also with industry and retirements. We no longer live there. Our house was huge and just my wife and I left, before it got to old at 16 years and wanting to remodel we decided to buy another new home, smaller with 3 brs and an office now on the coast 4 miles over the SC border in NC. I still like SC but we live in a resort here, yet spend a fair amount of time in the Little River to Myrtle Beach area. Costs are stupid cheap here in NC as well and there is a reason our county is in the top ten growing counties in the USA.
Being your kids are on professional levels they may find their higher income in other areas is eaten up by taxes and high housing costs. Infrastructure ? Maybe because we are from Long Island. SC was great to us. less then 3 miles off I26 near the Chapin area.
We took interstates wherever we went. 2 hours to the beach, a couple hours to the mountains and off those are i95 and i20.
Heck, NY has nothing close to an interstate system like that. Yes, you are right and barely see any police! 80 MPH is the norm.
As you can tell I liked the state a lot but I acknowledge everyone has a point of view where they live. There is a reason though for some people that makes SC and NC such a desirable place to move to and the numbers show it. It really depends on what is most important. I have another daughter who chose to stay in NY, near NYC and that is ok too!