You don’t appreciate the threat that ISIS is, apparently, nor how they are using the oil that they have seized to fund their operations.
I’m not ready to send ground troops into Syria—and I’m quite certain Trump has come out against that as well (he has said he’d let Putin keep going after ISIS, although that does IMO ignore some of what Putin is doing there), so I don’t know why you’re pretending that he’s for it.
In the campaign commercial he aired in Iowa he vowed to defeat ISIS and take their oil. Earlier he said is solution to the Syrian refugee crisis is to establish a "big, beautiful safe zone" for them. How is he going to do either without sending in troops?