When you read the whitepaper and study Bitcoin more you realize that one of the principles which is the central idea behind Bitcoin was its irreversibility. It is actually addressing an existing problem with previous payment systems (eg. PayPal) where the transactions can be reversed very easily and the problems such a feature creates for its users specifically the merchants (receiving payments).
What you are suggesting goes against that principle.
What you are suggesting goes against that principle.
Which parts of the paper you believe has this intention ?
Interesting point, however it seems:
1. Bitcoin has evolved beyond this point (see replace by fee feature)
2. Eventually the transaction will be permanent.