Final answer:
The statement about mass murderers being usually white males is too generalizing and varies by context. It is true that Europeans killed many natives during the exploration era, often with superior weaponry. The colonization's scheme had mixed reception among black abolitionists and it is false that women were unable during war to handle additional burdens.
Step-by-step explanation:
Regarding the assertion that mass murderers are usually white males, it is false to make an absolute statement about the demographics of mass murderers as it varies widely and is dependent on many factors, including geographical and cultural contexts.
Concerning the majority of the natives killed during the exploration period by Europeans, it is historically true that many indigenous peoples were killed or died due to diseases brought by Europeans, who had more advanced weaponry and inadvertently introduced pathogens to which native populations had no immunity.
Regarding the statement about the colonizationist scheme of the early 1800s being popular among black abolitionists, it is false. This scheme, which involved resettling free African Americans to Africa, had a mix of support and opposition within the black community.
In response to the claim that many women found themselves incapable of handling the burdens of war when their husbands and fathers went off to fight, it is false. Many women took on additional roles and responsibilities during wartimes, effectively managing both home fronts and engaging in war efforts.