No, it's not, and I for one get fed up with this constant self-shaming, or "riich western country-shaming" attitude.
The problem is the entire system.
Of course there is demand, but there is also supply.
Each side must maintain standards, rather than just choosing the cheapest options.
And both sides must hold each other accountable. Consumers must verify that production is sustainable, etc, and suppliers must insist on prices that support that, and reject quick-money offers/undercutting-schemes that undermine standards.
In this particulr instance, I think there is a case (even an imperative) for "the west" to try to impose eco-tarrifs or eco-certifications etc on Brazilian beef, in order to pressure for more sustainable production practices.