There is a general wisdom: if you invoke "the ends justify the means" you have crossed the border to the Dark Side.

I'm not going to explain my full understanding of this piece of wisdom, it would be a wall of text, I want just mention that this behavior is addictive: it is much easier to start justifying your means than to stop it. And over time those justifications become more and more flexible.

I'm ready to agree that there are situations in which ends justify the means, but if you are not aware of downsides in your particular case, and if it doesn't seem controversial to you, you are most likely mistaken and the ends do not justify the means.