Why doesn't the National League use a DH?

Personally, I like the use of a DH, it allows players who make not be great fielders a chance to be in the lineup rather than pitchers cause pitchers are usually not very consistent batters. I mean why put in a pitcher to bat who may have a .140 career average and maybe a few RBIs and HRs when you can put in a guy with a .270 career average with many RBIs and HRs although his fielding skills may not be that great? I mean, are there any benefits to letting pitchers bat, other than some sac bunts? I mean, it is just me, or should the NL utilize a DH position like in the AL?