[expat_panama]

...tariff impositions should be looked at on a case by case basis to decide whether outside governmental interests are manipulating the market...

Let's be sure we're both talking about the same things here.  A tariff is a tax on a specific import and the goal is to change the market for that import.  All tariffs manipulate markets on behalf of outside interests.

[Gaffer]

My take is that tariffs are not imposed because of ‘outside’ interests, but rather ‘internal’ interests.