We all have different means to get what we seek. Some of them are too noble, some are smart, many are average and some yes certainly cunning. The way we choose depends on our upbringing, our sense of right, and wrong, given situation and our extent of desperation.
I don't mind how to achieve things in life as long as it does not hurt people concerned, does not deny them a chance at success. Many a time, so far in life, I've seen people who are smart and clever and then move on to become cunning.
I don't think we can call it an 'Evil act', we can call it an undesirable quality in people close to us. The good thing is, it's just a matter of time before we spot such people around us. I would not avoid them but be wary of them as I don't give such people a sense of satisfaction that they have ruffled my feathers. In my view, it's just a matter of before they meet a more cunning person. Even a cunning fox can be outfoxed!
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease
We cannot call it evil, until it is not harming the other person.
A positive attitude will lead to positive results.