It's illogical enough that these groups whose creed and modus operandi state explicitly that no harm to any form of life should occur during any of their acts and that all precautions should be taken to ensure that none occurs are being likened to suicide bombers and others who commit acts with the specific intention of taking human life, but what skews things even further is that radical right wing groups -- even ones seeking to harm and / or kill people -- seem to have completely averted being painted with the same brush, either by government or the media these days. As Harwood puts it:
It would be a shame if groups that firebomb property with no one inside get more scrutiny than those inclined to park a truck bomb outside a building teeming with people and then proceed to detonate it. [...] Destroying innocent life for political purposes is terrorism. Destroying million-dollar properties for whatever reason is felonious vandalism.