Nothing is “groundless”.
Every printed or worded thought has a “basis”.
The conception of a thought is only your conception of thought. This as we know each is different depending on the person.
Our interests, concerns, ability of creative thought and free will sometimes leads to dead ends in our conclusions of statements by others.
If more people would consider thoughts as a hypothesis instead of a statement of fact, then no thought would be conferred “groundless.”
Human history has been filled with hypotheses, they fall into several categories.
Some categories are: proven, unproven, conception, contain variables and humorous.
As our minds develop, we form ideas and guidelines, some people develop into a triangle, where as their timeline moves forward they become caught between two barriers which finally end at a peak. Some people never form the triangle and are open minded and do not become constricted during their timeline on earth. They keep "maybe" as a possibility.
Truth is a delusion as is factual statements which unfortunately are based on preconceived ideas and non determinative parameters.
Such as 2+2=4.
It depends on what your idea of what 2 represents. Think of it openly, 2 apples and two more apples may end up as four apples, unless someone eats one right before the = sign. 2 people plus 2 people may equal 6 if they mate and have children. As you can see every equation is not definitive because you can interpret them differently. To argue anything as groundless is to say there are no variables.
In binary math we use terms such as yes and no but never maybe.
Our minds are not binary, therefor we can use “maybe”.
To say something is “groundless”, you have forgotten “maybe”.

From what I have learned in life, there are always someone or some group who hates someone else, but what we as people of the world should really care about is the future and look for who likes who and not who hates who. Spread love by talking love. IMHO
BTW yes the American indians were screwed, but so were the african slaves, the irish, the chinese, white people, the miners and recently the American people in general by Bush. Etc Etc. forget the past and start a new world. one love! one people!
I stopped using the hate word, it's bad for your karma!