Well, look at it this way.
You’ve sinned. If you ‘need’ to confess before receiving communion, it’s a mortal sin. . .even if you plan on confessing ‘the next Saturday’.
You do not **have to ** receive Holy Communion at Mass, you know. There is no law forcing you to receive at every Mass.
Therefore, knowing you have sinned, it would be best to forego communion, making a spiritual communion instead, and confessing as soon as possible. And of course being sorry.
Why would anyone take the chance of not having made that ‘perfect’ act of contrition and risk receiving Christ while in a state of mortal sin, since that itself would be an additional sin, when one is perfectly capable of not putting oneself in that position?
No matter how much love we have for the Blessed Sacrament, we must receive worthily. Especially when it ‘seems’ that so many do so unworthily.
We don’t change the rules because “everybody else doesn’t care if they’re in mortal sin, they receive because it’s more important to take communion”. It does not matter if every single person in church was in mortal sin and ‘wanted’ communion before they would have a chance to confess, it still does not make the action morally right.
Why do people think that because it is physically ‘possible’ to do an admittedly good action (receiving communion) that it is necessary to do so, regardless of the state of one’s soul and one’s worthiness to receive? It is hard for me to understand this. . .