Not true. Alexis pleaded with the Pope and others for assistance leading up to the First Crusade.
Didn't turn out perfectly well for him or his successors, but the Byzantine Empire certainly had a good bit of pressure taken off it for quite a while.
one of the biggest factors to the spread of these towel heads was the black plague....the societies attacked were rife with death and “no hands on deck” led to defeat...not mentioned enough in my eyes.
You are right, he did ask for assistance, but he asked for military aid, not crusades. The crusaders were threat to Constantinople, and as pointed out earlier, followed thru on the threat.