Maybe, but wanted to 'get their attention' by blowing up a mass public transit hub in the heart of London in the middle of the day, likely killing hundreds of commuters, across the Atlantic who had nothing to do with it all.
What if the trailer is purposefully misleading? Say, Harrison did not blow up the hub, and the attention quote refers to something else, say the helicopter offensive. The explosion in London could have been an attempt to frame him.
It could also be that it wasn't him in the helicopter and these scenes were also cut to be misleading, but that would be going too far, and I assume it contradicts something that's already released elsewhere.
It's unlikely, but I would not mind if the real plot strays from what appears
to happen in the trailer. And as it is, there is a lot of room to make him a hero, or not make him the ultimate villain.
As for a more realistic option, it is possible that whatever he is going after is so unimaginably horrendous that his actions are close to being justified. Something on the scale of building Genesis-like devices for genocide against the Klingon empire and the Romulan empire. Yeah, something like that would make him redeemable.
I hope the 'crime' isn't something as simple as abandoning Harrison behind enemy lines or something like that.
Blowing people up because you're butthurt? I told you Cumberbatch is playing Charlie X.
I have my hopes that he's not as immature as me and Charlie. I am betting that he has his reasons, and they are good. Perhaps not good enough to justify what he has done, but good enough to not reduce him to such low level.