I'm assuming you've never seen a bicycle child seat? Fits on standard bikes: https://specials-images.forbesimg.com/imageserve/5ef62a3b8826b50007fe74a1/960x0.jpg
For up to 3 kids you can use a longtail cargo bike: https://xtracycle.com/cdn/shop/files/eStoker-Matte-Black-1536x1024.jpg - I see those hauling kids all over the Boston metro area since there are decent bike lanes and paths there.
And if you need to haul more kids than that, get ready to have your mind blown: https://youtu.be/uHsAaZI3hfc
In the phrase "security through obscurity", obscurity means obscuring how the system works, eg making the source code secret. Mac being less popular has nothing to do with security through obscurity. The argument is that a less deployed platform is a less valuable target, which is absolutely true.