Foolish constituents don't care as much (8)

I believe the answer is:

mindless

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'foolish' is the definition.
(similar in meaning)

'care as much' is the wordplay.
'care' becomes 'mind' (I've seen this in another clue).
'as much' becomes 'less' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'mind'+'less'='MINDLESS'

'constituents don't' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for mindless that I've seen before include "Unthinking" , "Crazy" , "Acting with no concern for the consequences" , "Without thought or care" , "Stupid" .)

I've seen this clue in the Sydney Morning Herald.

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