I have played enough to know that it is nothing short of delusional to think that scoring a goal at 4-0 up is easier than scoring a goal at 0-0. Too much console gaming can create that impression (championship manager, football manager etc must make it seem like after 2-0 it just gets easier to score more)Nah. Just nah.
Playing against fresh legs with a game plan and at least a point to defend is different to playing against tired legs that have totally lost their heads.
If you can't see that, a) you must only watch occasional highlights and b) probably never played a single 11 a-side 90 minute game in your life