Avoiding conflicts is generally a solid advice to follow. However, at times, disagreements (perhaps a better term) are unavoidable. By this I refer to those moments when someone needs to speak up in support of others and with collaboration and progress in mind.
However, even during these disagreements one needs to remain professional, respectful and polite, but the points of value must be made effectively. Remember that no single individual should be able to stop much needed progress and advancement for hundreds or thousands of people. Similarly, if you have an opportunity to make such changes please make sure you do so for the benefit of those who may not be able to voice their concerns.