In the bridge game, why does the contracting party receive negative points after completing the contract and winning several tricks?

There are several types of scoring in bridge games. Team competition, double competition, and point system are the three most commonly used ones. Winner is not just about completing the contract. Otherwise, if I have 13 spades in my hand and I only make a one-spade contract, I can still win points. Isn’t it a big joke? Do you think so?

The same cards are played on different tables in 1-team games and double games. A pair of players is not competing with their opponents at the same table to see who has more points, but with players at other tables who have the same cards. For example, if I take 13 spades, I play 1 spade to make a super 6 (of course I am just assuming). Our team scored 260 points, and our opponent at the same table scored -260 points. Does this card count as my win? Definitely not going to win. Because it needs to be compared with other tables, others will definitely call 7 spades and score this card. Score 1510 points (without game) or 2210 points (with game). Of course I lose. Who can I blame?

2-point system: only four people per table, no one else. Then you have to compete with your opponents at the same table. Doesn’t it mean whoever gets the better cards wins? That's not fair again. Therefore, it is stipulated that those with good cards should be given points. For example, if my partner and I jointly get 28 big card points, which is 8 points more than half of the total number of big card points, we must give 8 points to the opponent for this card. For this card, I called 2NT and scored 150 points, which is converted into 5 points, but we have to add 8 points. So even though I made a contract with this card and it was one trick over, I still lost 3 points. Is this reasonable? It should be said that it is more reasonable, because generally taking 28 big card points should be able to make the game, but I didn't call, so I can't blame others.