They are hard wired to be unpredictable. Predators have been issues for squirrels for probably the past million years or so. Wheels going faster than 10 mph about 200 years. In a few centuries I suspect we will see some changes in squirrel behavior. (The American buffalo changed from circling up to face enemies to running away to adopt to mankind that started using bows and arrows. They couldn't adopt fast enough to the new guns of the later half of the 19th century where one man could fell 100 or more of them from out of sight and earshot.)
Squirrel patterns work really well in the wild. Don't believe me? Look at how many of them are out there. (And we should be thankful for those creatures. They reforested much of the northern half of this country by stashing acorns and seeds and forgetting where they put them/planted them. They have a 10% recall rate on where those acorns got stashed. That's a lot of future trees.)
Ben