Most anarchists i've met tend to be focused on the practical and spend most of their lives thinking and talking about the ramifications of their actions and political action in general.

If you're seeing similarities between 'rightist nihilists' and anarchists, you're looking at stereotypes and not reality. They're world's apart. Anarchism requires a core of burning optimism about human capacity for co-operation and self governance. Depending on what you mean by 'rightist nihilists' you're talking about no strong beliefs or diametrically opposed beliefs, goals, organizing structures, etc.