Wouldn't a little fletching make throwing knives easier?

Because throwing knives are thrown and travel end-over-end along their flight path, not straight-on like an arrow, so they can't be fin stabilized, I would imagine.
 
No spin style it would work but probably be in the way, many flat or no spin daggers have a tail tied to them, works like the tail on a kite. Does not work well for any type of spin throwing.
 
As has been mentioned, if you have your knives throwing in the air, stabilisers would mess up the flight. In no spin throwing, stabilising would of course help - though beware, in European competition rules, there's a clause outlawing stabilisers :)
A no-spin (sort of) throwing knife with built-in stabilisers is the Gyro Dart.
 
I think I may be part of the reason lawn darts are banned. I threw them every which way I could. Really amazing I never killed anybody when I was a kid.

Anyway over hand they didn’t stabilize so good. But under hand they were deadly acurate.
 
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