Most rich people don't just stand around outside waiting to get shot. Especially not if they know someone is gunning for them. They may be morally bankrupt, but they're not stupid.
I would suggest to, first, join your local Eco-social organizations. Normally the "take a gun a shoot a motherfucker" approach, while very satisfying to say, it's usually way less effective than organize with your community.
Totally agree, hence, the need for organized non-institutional action 😉. In institutional terms, the difference between a bunch of eco-anarchist and eco-terrorist is pretty nebulous to say the truth!