Studies have shown time and time again defensive driving courses do not work. You may learn to skid control now but will you prefect it in 6 months time, without practice (where will you practice it? Not on the streets, is 'hooning'), when you need to use it?
I am no angel here I have skidded in a car accidentally, and most times was able to control it (Thank you GT3-5 LOL!), but when that has happened I was either going too fast, didn't read the conditions right or wasn't paying attention.
I am in favour though of an attitude-based approach, like AAMI skilled drivers program I did. There is also the Institute of Advanced Motorists approach in the UK (we had groups out here in the 70s/80s but it died out). The IAM uses the system of car control or 'roadcraft' approach. i.e. when you see a hazard run through Position/Speed/Gear/Acceleration drill as appropriate. Very respectable, has always been in partnership with the UK police and studies have shown to be very very effective.