STOCKTON — No one chooses to be homeless.Adam Cheshire should know. He’s been the man in charge of running San Joaquin County’s largest homeless shelter since 2014.“When people talk about the homeless, there is a tendency to lump everyone into a group or to generalize. When you work with the homeless every day, you realize it’s impossible to generalize,” said Cheshire, CEO of Stockton Shelter for the Homeless, 411 S.