When I first saw it, I quite liked it.
But the more I think about it, it makes little sense.
I get that Walt is really unhappy he just found out he has cancer and may leave his family in debt,
But to blow up someone's car just because he's an entitled douche bag seems psychotic, not to mention that its next to gas station which could of blown up and injured or killed many innocent people and caused $1000s in damage.