It was quite common for angry civilians or civilian police to beat up or even kill Allied terrorflieger, particularly bomber pilots, before Luftwaffe personnel arrived to take custody of them; even then, they may not have been safe. German Reich Propaganda Minister Joseph Goebbels encouraged civilians to take part in reprisals against downed allied airmen in the spring of 1944.

With the lifting of ground-strafing restrictions and the subsequent counting of ground-killed aircraft towards "ace" status (this particular order is generally not recognized when tallying the total victories of WWII American aces in modern writings, as these weren't "proper" air kills) on February 11, 1944, those fighter groups released from escort duty and that still had sufficient fuel and ammunition were free to drop to low level, destroying anything that was useful to the German war effort, including parked planes, locomotives, rolling stock, and even cattle or equipment on German civilians' farms, on their way back to base.

Sources:

The Fire: The Bombing of Germany, 1940-1945, by Jörg Friedrich