As do wars. Past interventions breed future conflicts. Were it not for WWI, WWII might never have happened. Were it not for previous American and British interventions in the middle east, including our carving it up into 'countries', conflicts there might never have erupted or escalated to their current levels. What you say of entitlements is just as true for war, if not more so. An entitlement program can
be ended, tough as it may be to do so. A foreigner pissed off because his loved ones were needlessly killed to support the agenda of some foreign power he doesn't give a **** about is a lot harder to erase.