What kind of glove is being shown in the following pictures, and why is it nearly always a knife user who wear this style of gloves?
These gloves are called finger loop sleeved gloves but sometimes also referred to as (long) Fingerless sleeved gloves. 

They more often then not come with no holes at all, or with only a thumb hole. However the one in the picture is not unheard of either 

The image below comes from an ebay search on sleeved gloves, similar results can be found on amazon as well.