Its not really a causative factor it's more a "risk factor". You can have high risk factors and never have a heart attack or issues. And cholesterol itself has less impact on blood cholesterol values compared to saturated fats but egg yolks contain good amounts of both. But if you don't have any abnormal blood values and you are in good health eat all the eggs you want.
But as you yourself admitted, dietary cholesterol has so little effect on your actual cholesterol levels and even then,
IF you already had high cholesterol and
IF dietary cholesterol would add to this, there is still very little evidence that having overall high cholesterol increases your heart risk at all anyway. Same goes for saturated fats.
The specific kind of cholesterol you have that is elevated is far more important than overall cholesterol being higher. Small dense LDL particles (
note not all LDL but specifically the smaller more denser ones) are the ones that have an involvement in the process of inflammation, but dietary fat or dietary cholesterol doesnt produce these lipoproteins. It is actually a diet that is high in simple carbs that would lead to them. Furthermore, it really isnt the cholesterol itself that is to blame but the inflamation (again which is caused by a diet high in simple carbs
NOT dietary fat or cholesterol intake.
Now for a little more on LDL... When it is oxidized it does pose a threat. What oxidizes them? Free radicals. Where do these free radicals come from? Mainly from trans fat, (which I assume we all know is bad and obviously arent included when I say "dietary fat" ). Now to add even more to this, fruits and veggies contain plenty of antioxidents which will help combat these free radicals. So.. If ones diet is low in trans fat, low in simple carbs and high in veggies and fruit you shouldnt fear dietary fat (with the exception of trans fat) or dietary cholesterol. These high carb/ low fat diets that are pushed onto us are far more damaging then any amount of eggs you eat