Re: It only makes sense.
Being in the country Illegally SHOULD be treated as a serious crime.
Bollocks should it. It's no worse than having strayed on to private land without permission.
To me, at best, it's simply jobsworthian to suggest merely being here when one shouldn't be is a serious crime. I am not saying that shouldn't be addressed when it occurs but real crime rests upon harm done and damage caused.
If someone wants to come here, to work, support themselves, pay their taxes and dues, contribute to the country as much as anyone else does I don't really see the harm being done. In fact they are probably contributing more than those engaging in tax evasion and avoidance.
If people are acting illegally beyond just being here without legally being allowed to be then yes; address that.