It won't affect his career. If anything, it'll just make people notice him more. You only have to look at Terry, Suarez and Vardy as good examples of the so called "negative" impact of being caught.
I also think you're really missing the point and you, yourself, are suggesting a very bad...
The alternative argument is that if it was Luiz Suarez, he'd be hounded by the media, given a hefty fine and banned for 8 games.
A better example would've been John Terry. Now John Terry is a racist, who got away with being a racist, and never had to apologise for being a racist.