edit: "invading their neighbors" is a rhetorical trick to discount all of the invasions of the US against countries who are not our neighbors. Just like "killing his own people" is a trick to discount the killing of other people.
According to DW news[1], the US is in Syria for these 4 reasons:
> Firstly, they were there to sustain the fight against the extremist IS group. This includes helping to train and arm the Syrian Kurdish fighters, known as the Syrian Democratic Forces, or SDF, who fought the IS group and who now control this part of Syria. The US regularly warns that the militias it supports here may only fight the IS group, unless they are acting in self-defense.
> Other American priorities in Syria include supporting local ceasefires, stabilizing the area and helping with humanitarian aid and access, as well as "pressing for accountability and respect for international law, while promoting human rights and non-proliferation."
> All of these are supposed to help in achieving a political solution to the ongoing Syrian crisis, as set out in Resolution 2254, agreed upon by the UN Security Council in 2015.
1. https://www.dw.com/en/what-does-the-us-actually-want-in-syri...
1. A hot war emerges due to it's aggression
2. The aggression is unchecked, effectively meaning the victims surrender to blackmail and/or violence
3. A cold war is put into place to prevent aggression through deterrence and other mechanisms to manage the situation to prevent escalation to a hot war.
My concern is that both Democrats and Republicans (and most other countries on earth) are not committed to a cold war and communicating that with the public. I'm far more concerned the US will surrender several more countries and territories to aggressive states before people realize what's going on and are ready to commit to a cold war to contain aggression.