I don't think this was a planned act of terrorism, but I couldn't rule out that it turned out to be an opportunistic one. Maybe he thought he was going to jail for a long time anyway so he might as well take a few white people out when he happened to find himself driving on a parade route.
What really burns my biscuits, though, is the idea that it is okay to wildly speculate about white people when they do something but if you speculate on the motivations of POC, that's somehow racist. If the media was consistent in how they approached these situations, it wouldn't anger people as much. They should only report the facts and not make a rush to judgement (well, the media shouldn't be making a judgement at all -- they are there to report not opine). Somehow that rule only gets applied if the suspect isn't white.
The difference in reporting doesn't just happen once in a while. It is a consistent pattern and anyone paying attention can see what they are doing. It's one of the reasons why I don't trust the media to tell me the truth about anything any more. They really are in the business of narratives, not news.