You make some valid points and overlook others that are relevant to the hard issue of responding to the demands of Syrian refugees in a world where other humanitarian crises exist.

The USA was not the only interfering country in Syria.  For religious sectarian reasons, as well as selfish economic ones, Saudi Arabia, the Gulf states, and Iran interfered mightily backing this side or that with money and weapons.  And for religious sectarian reasons, millions of Syrians voluntarily became partisans in their country's civil war: many Syrians did "these things" to themselves and to other Syrians whom they saw not as countrymen and countrywomen but as members of a different religious denomination.