That phrase, "Love is Blind", is open to many interpretations.
Some people think like you, taking the phrase literally (which is
NOT wrong, by the way). Some prefer to interpret it as accepting a
person, faults & all.
It doesn't mean you don't correct a person when you love them. A
parent wouldn't want a child to get into trouble with the law, or
do anything to jeopardise his/her career, his/her life, etc. But
despite all these faults a child may have, doesn't the parent still
love them? If the child still had these faults, the parent wouldn't
simply give up & stop loving them, right?
The above is the 2nd interpretation of Love is blind. You love that
person despite that person having faults, even if you try to help
the person overcome certain ones which you feel may be detrimental
to their well-being.
If you smoke & your parent tells you Not to 
their love is Not blind? Another way to interpret it is,
your parent tells you Not to, but if you choose to continue your
habit, they'll nag at you like mad but they'll still love you
anyway 
FeowFeow
