Because Cruz will also secure the border, plus eliminate the magnets that attract illegal aliens, resulting in large-scale self-deportation -- all with much less fuss and bother.
There is another consideration that is almost never considered. Which is more likely to actually get done?
1. Forcible mass deportation.
2. Elimination of job opportunities and welfare benefits, thence resultant large-scale self-deportation.
You understand that a President simply can't decree either approach. In either case, he will need the cooperation of Congress and a significant segment of the federal bureaucracy -- not to mention the continued support of the people.
Which is more likely to achieve its ends?
Cruz is going to have to bend a knee to his cheap labor express donors. He will do very little on immigration. It will lead to full amnesty. YOu are deluding yourself if you think all those wall street donors of Ted’s want a secure border.