They are currently the Oakland A's, yes... but like I just said... there's not much land available in the East Bay for building a stadium close enough to Bart. Building a stadium in San Jose would coincide with Bart extending through to San Jose, right to the stadium.
The only reason the Giants are doing this is to be total fuckwad assholes and try to kick the A's out of the Bay Area so they could lay claim to the entire area - making them the only ticket in the bay area all summer long for the largest metro area of any one team in the country...
History lesson:
The A's gave San Jose to the Giants in 1992 so they didn't have to move to Florida... The Dodgers even pleaded the A's to keep them in town...
The Giants were thisclose to moving to San Jose on their own (Actually Sunnyvale or Mountainview - right by where the Googleplex and Shoreline ampetheatre are, but close enough lol), until they were able to garner enough votes for the Phonebooth Palace...
I wish the A's could stay in Oakland, but if San Jose is where they need to go, then fuck off, SF... give us our land back...