There is no such thing as necessary evil
There is no such thing as necessary evil. So no. If you know that what you are doing is evil and you are trying to convince yourself that it is worthwhile, you shouldn’t do it. You should never be trying to find benefits in something that you know is evil, because you will literally find anything to deceive yourself with and will purposely ignore catastrophic consequences that are unavoidable with an evil action.
If you are even remotely concerned about good and evil, you should be aware of these consequences in a spiritual sense that transcends mortal understanding. Not because your soul will burn in hell after you die, but because reality is far more complex than you can comprehend and understanding why being good or evil matters is essential to navigating reality effectively.
If you are considering something you know is good but potentially problematic for various related factors, thinking about outcomes like that is different because of how the intention of your mental faculties is oriented. In those cases, you look for problems to find their solutions and justify good. In the former situation you are asking about, you are looking for solutions to justify problems that are evil, which is pointless because you will purposely lie to yourself and then fail at your goal as a result. See what I mean? This should be obvious if your goal was actually good, but because you are even asking this question you seem to have no desire to be good at all. Hopefully reading this will educate you enough so that you start considering the results of your decisions a few steps ahead.
There is no such thing as a necessary evil.
Also, no person wants to be evil. Not a single one. The only reason they think they do is because they don’t think two are three steps ahead, usually on purpose, which is stupid. Being stupid can be funny if there are no consequences and you are making a joke that is intended to make people happy, but being stupid in an attempt to do harm is one of the most dangerous and harmful evils humans can do.
(Some people will say the consequences of being stupid to make a joke are at the expense of self. Depending on the perspective, whether it be from an evil mind or a good mind that can be a loving or hateful thought. However, in either case, there is no expense because that source is infinite. It’s like saying the Monopoly bank has an expense when they pay $20 dollars for a player winning second place in a beauty contest. … What, we ran out of money? … Let’s see… Here’s a deck of Uno cards. We’ll use these in place of money.)
Imagine if when the Jewish high priests in Jesus’ time learned about Jesus, they set their selfish pride about their social status aside, and said, “You know what? I think this guy is on to something. We should probably listen to him and try to adapt to the new age we live in because things are different now. The age had already turned, just like it has now, but they were resistant to it with futile, fruitless, and evil efforts to change the new age to be like the old one. Instead, they should have found ways to adapt the old ways to the new age.
The new wineskins need to be used, not the old ones. How did we make them before? Let’s see how we can apply that process with the new features that are available now and maybe we can do something new and improved, or maybe we can even eliminate stuff from the process that is unnecessary and needlessly expensive so the entire process is easier altogether and more people can enjoy the good wine.
I don’t care how attached you are to the old wineskins because you raised the goat, slaughered it, took its hide, and spent countless hours of craftsman training to be able to turn it into a useable wineskin. Let it go. That’s not what’s important. We don’t make wineskins to have a wineskin. We don’t operate a government and pay taxes to it to have a government.