It's not a disincentive, it's an unfortunate result. Many kids are coming over with drug dealers, child traffickers, etc. masquerading as a "parent" to take advantage of former policies of letting anyone with kids in. If there are doubts they separate for the childs safety. They are not and have not separated kids when families try to legally ask for asylum (as is being falsely reported) They are not locking kids in small cages (as is being falsely reported), They are separating for the childs safety for a short time then often shipped off to a relative already in the US, often the other parent or if no parent or relative can be located being put in foster homes.
Most of the news being pushed out there is either straight up fabrication or twisting the situation to make it look cruel and blame Trump.