Why is hating everyone OK?

I am sure I've written about it before, but why, again, is hating all people much more acceptable, both legally and socially, than hating some group?

I think a direct incitement to kill people is illegal in any case, but anything short of it is not. If you write something along the lines of "I hate all Asians, they are like a cancer spreading on our beautiful planet", or even "Asians totally suck and are worthless and smell bad" the police will be at your door pretty soon. Ditto for blacks, whites, or any race or ethnic group you can think of. But you can write such things about all those groups put together, and not only not get arrested, but not even necessarily considered a psychotic creep.

Isn't it time to rethink this, especially considering that - thank God for small favors - I don't remember anyone ever committing a murder of a group of Asians, whites, blacks or anyone else for racial or ethnic reasons in Finland, but we just had a second spree killing for misanthropic reasons within one year?