- It wasn't exactly an apology
Netanyahu apologised for "any mistakes which led to the loss of life". Well yes. As far as Israel is concerned, it is always apologetic for mistakes which lead to loss of life and always regrets loss of life full stop. As much as western media will try and portray Israel as some sort of vicious, murderous and blood thirsty nation, content with nothing more than spilling the blood of those who do not accept its right to existence this is simply not the case. So of course Israel is apologetic for any mistakes which lead to a loss of life.
Crucially, there was no apology for the raid itself. Frankly, that is not something Israel has to apologise for anyway.
- There was probably an incentive involved
Quite simply, Obama must have convinced Netanyahu that it would be worth his while. Perhaps it has to do with Turkey's strategic position with regards to Iran or just simply the importance of ties with neighbouring states for reasons including, but not limited to, the fact that Syria is in a very dangerous mess at the moment.