While Crooks was allegedly a registered Republican (let's not forget that PA Democrats were encouraged to register as Republicans to primary Trump out), he also reportedly donated to ActBlue on Biden's inauguration day.
The disturbing image unrevealed is how he decided to crawl up on a roof and take a shot at POTUS Trump. My guess is that a series of deceitful, maniacal, derange-riddled emails he received from dozens of political action committees resulting from his giving his email address to ActBlue set him off. But it’s just a guess.