battles worth fighting?

Friends are there for us through thick and thin, but at times, can those friends be there for us too much? Sometimes we push our friends away just for being there, or 'not caring' and sometimes for caring too much. In reality it's mainly because our friends share a different view to us, and we don't like it. So we argue and push them away.
So what arguments are worth fighting, and which aren't? Sometimes being the best friend can ruin your relationship. If a friend wants to make a decision which you know as an outsider is a big mistake. You're best off not pushing it, especially when it involves something close to their heart. A partner, or family etc, because the chances are they aren't going to change their mind.

As a friend, we should always respect the decisions of other people, if it's what they want to do, even though you know it's wrong, sometimes the best thing we can do is sit back and watch them make their own mistakes so they can learn from them.
People say the best friends people can have are the ones who step in and no matter what, will always stop you from making the wrong decisions, and I personally believe that is true. But sometimes we can't learn lessons in life unless we've personally made the mistakes, or at least watched people around us making the same ones. Plus the factor of the person in questions personality.

If it's clear that that person isn't going to change their mind, the best thing you can do is just sit back and support them through the decision, no matter how hard it is to watch. Because at the end of the day, what are you going to achieve? Nothing, apart from the possibility of losing a friendship. Unfortunately it's a similar situation to one that I've been involved in this past year, and one of my friendships fell apart. If you try and stop someone from doing what they want to do, no matter how wrong or how stupid it is, they're going to lose respect for you, because you're being 'unsupportive.'

You just have to figure out if it's something where your opinion in their decision is one they're really going to listen to, because if they want to make that decision enough, they won't, and is it worth losing a friendship over?