according to what you say the owner of hnn.net (sold in other part of this forum) is not allowed to have the name unless he has a company named "Henry's new napkins" for example
No, that is not what I am saying. The merits of each of these things needs to be considered in view of the individual facts and circumstances.
For example, the defense of pwc.com against Price Waterhouse Coopers was successful because the registrant of that domain name was actually using the domain name for PPC links to vendors of personal watercraft and equipment, commonly known as PWC's. But using HSBC in a PPC program which includes financial service links is a no-brainer losing situation. On top of that, while there may indeed be someone who has trademark rights in "HNN" for some specific goods and services, HSBC is huge and very well known - plus, if you are in the US (since it is a .us name) and HSBC has registered TM rights in the US, then you are on constructive notice, by law, of their trademark rights whether you personally have heard of them or not.
It's not as simple as "they have a trademark - you lose", and that is not what I said.
But I do have a visceral reaction to the common pattern of someone saying "the domain name COULD be used for X, Y, or Z" as a defense, when they are not doing X, Y, or Z. I mean, crikey, I can shoot someone on the street because they COULD be a murderer coming to get me, and I would be acting legally in self defense. But if that is just not the situation, then the "hypothetical defense" argument that so often gets trotted out here does not impress me.
Don't take it personally. You simply provided a convenient opportunity to make that point clearly.