Do take into account that there are places where infrastructure is designed primarily around cars. This means a.o. that wherever you want to go, there'll be pretty good parking really close by.
Combine that with a lack of proper bike infrastructure. No bike racks anywhere in sight, so you have to dump your bike on the pavement, hoping nobody will give it a shove because it's in their way. No bike lanes, or if there are, they have angles and corners that are not realistic to take on a bike. Corners that have you swerving into the opposite lane if you take them at anything above 15 km/h.
In those situations taking the car for short distances becomes the convenient, fast and safe thing to do.
P.S. from your name I suspect you're Dutch. In that case you don't even have to go far to find that sort of situation. I live in Belgium, which is generally considered to be a rather bike friendly country. I beg to differ. Everything I describe above applies, at least in a region of a few kilometers around my house. I can only assume it also applies elsewhere in Belgium.