Congresswoman Nancy Mace slammed cops at the Charleston International Airport last week for what she called "incompetence" ... and now she's doubling down.

It all started Thursday when the representative from South Carolina had a complete meltdown after airport cops -- who were supposed to escort her from the curb to her flight gate -- didn't show up at her correct drop-off spot on time. She reportedly launched into an expletive-laced tirade in the airport as a result. Getty

In an interview with Fox Business' "Mornings with Maria" Monday, she cited rising political violence as a reason for her behavior, saying ... "In the political environment we have today, there's no room for error when it comes to security."

She continued to disparage her hometown airport, saying it's th

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