1.  Of course Dreamers were being held responsible by the government. Who else would be holding them responsible?  
2. Well, Dreamers came forward while others didn't. By doing the right thing they have given their info to the government who can then use it to deport them.  They didn't have to.
3. Your comparison is still not equitable and I've noticed you steered clear of Japanese Internment.  If I need a shot to go to school I just go get a shot. They don't ban you from school and working for life even if you do the right thing and get a shot when you turn 18. Again, one is a public health hazard and the other isn't.
4.  You are unnecessarily ruining the lives of young people. It's clearly a punishment.