Why would the activist bishops want more Latino Catholics in the U.S.?   They know these Latinos are here illegally, and they know they have home countries to go back to.   Why is it so important that these Latinos take residence in the U.S., rather than in say, their home country of Mexico?

The answer is votes, and power.  If the bishops get their dearly hoped for immigration "reform" (translation - -total amnesty and instant citizenship for 20 million Latino illegal aliens), then that will make a huge difference for the political power of the U.S. Catholic church.