A decent percentage of these immigrants are seasonal. A very, very small percentage of the total of undocumented immigrants have criminal histories. Focusing efforts on violent criminals is reasonable, but that doesn't meet the propaganda numbers from the current administration. Deporting tens of thousands of people just doesn't rally hate the same way.
Rather than spending time and money building concentration camps, building out secret police (ICE), and deporting people without due process, we could be fixing our immigration system.
Let's make work visas that allow migrant workers to work seasonally. Let's add paths to citizenship to migrant workers. Let's prioritize fast paths to citizenship for students, especially those with masters and PHDs. Let's introduce a point system to encourage immigration of the best and brightest from high demand countries, allowing them prioritized visas, PRs and naturalization. Let's fix the DREAMER situation by providing those folks clear paths to citizenship.
The reason the immigration situation doesn't get better is because republicans need it to be broken. They use undocumented immigrants as a group to target hate against, which rallies their base.