Should it be trimmed and styled or left to its normal progress.
God - be glorified - has not created anything in vain.
To everything He created, there is a purpose and aim. Sometimes, we know the reason, and other times we do not know that.
For the ear-hair, I think it is better to leave as it is; but if ugly-looking or some other reasons, you may cut, but do not uproot it. That is because - according to our knowledge - such hair has a special function like preventing some dust or small particles or may be small insects from harming the ear.
If one uproots such hair, this
may (but not necessarily) lead to some infection in the hair follicle, which will be like a small pit.
Some examples:
the
wax of the ear: kills insects that go inside the ear; has an antiseptic effect (contains some enzymes and surface antibodies against some bacteria and fungus in particular); therefore over-enthusiastic cleaning may lead to fungal infection of the ear.
Another example: the
fat excreted on the skin of the hand or other parts of the body: it gives the skin some elasticity (and also some anti-septic effect); therefore, the exaggeration in over-cleaning the skin may lead to dryness and fissuring of the skin, in addition of its exposure to some skin infection and allergy.
This is what I think; but
it will not be a major crime; the crime is to associate others with God and to contradict the major Commandments.
eanassir