RE: how can a crossbow be easier ?
The average archery kill shot is less than 20 yards. The act of drawing the bow when the deer is that close is probably the hardest part of archery hunting. Yes with the let off you can draw slightly ahead of time, but still must hold at full draw manually. Relax your draw 1/2 inch and letdown WILL happen. Most bows weigh at least 4 lbs - after a few seconds of holding this weight at full draw the bow arm starts to tire and the shot begins to break down. Aftert 30 seconds your chance of maintaining form, accuratley aiming and releasing a good shot becomes less likely. If the deer spots you, the draw cannot be held indefinately - you will move and spook them.
These are a few of the things that make a xbow much easier to KILL with. Since it is drawn and locked ahead, you can rest it well before the deer is in range and hold forever to wait for the shot. You could even lay prone and wait - probably the most accurate way to shoot a "stocked" weapon. Try that with a compound!
To be successful. a xbow shooter must be a good hunter - you still have to set up close where there are deer. However a good hunter will be far more deadly with a weapon that allows minimal movement when the deer comes in range. A xbow does that - a compound does not.
Steve