Why would a politican vote against deporting illegals who are convicted.of sexual assault or domestic violenct?

HR 7909

158 Dems voted against it.  No Reps votes against it.   Passed the House.. 

No. I am vague figuring people can search it themselves rather than just taking the opposite position I take. 

Okay, I've read it. It duplicates existing law, which is why they opposed it - it's unnecessary and is being used to demonize immigrants.
The lack of a waiver clause is cause for concern. My son-in-law was convicted of DV because he grabbed his ex-partner's arms, bruising her wrists - to stop her from continuing to lay into him, she'd broken his nose and knocked a tooth out. Everything depends, there can be extenuating circumstances.