An attitudinal fix refers to solving a problem or resolving a conflict by bringing about an attitude change.
Persuasion, mediation, diplomacy, and consciousness raising campaigns are ways of doing this.
Only problems or conflicts which involve feelings, emotions, and associated value judgments—that is attitudes—are amenable to such fixes.
Thus engineering problems—ones set entirely in the physical environment and/or involving controlling nature—can not be solved by finding an attitudinal fix: their solution must involve a technological fix.
Thus in seeking to end a war, some may prefer a negotiated settlement (an important part of which may rest on attitudinal fixes), whereas others may seek a military solution (built on technological fixes).