"No estoy en contra de todas las guerras. Estoy en contra de las guerras estúpidas."

Simplified Meaning:

Some wars have clear reasons and noble purposes, such as fighting for freedom or defending people from harm. Other wars, however, start for foolish reasons without thinking about the bigger picture or the aftermath. For example, a neighborhood fight that starts over a small misunderstanding can escalate unnecessarily when people don't think it through, causing more harm than good. Similarly, a country may enter into a conflict without a good cause or plan, leading to needless suffering. The idea here is to choose battles wisely, focusing on ones that genuinely matter and avoiding those that are unnecessary or won't achieve anything worthwhile. So in life, before taking on a big challenge or conflict, it's worth considering if it's truly important and if the outcome justifies the effort and possible negative consequences.