I feel there is danger in just classing any violent outburst with mention of religion or some political cause as "terrorism". In fact it is as if government/media wanted to highlight these occurrences to justify other actions.
Most of the " lone wolf terrorists" seem to be extremely angry about one thing or another and have psychological issues, they may well have sympathy with terrorist groups but that does not mean they are part of a conspiracy to bring about political change by violence against the civilian population.