Having opinions is costly.
If you get attached to them, there’s an emotional toll that comes along with observing realities that are inconsistent with your opinion. If you decide to promote them, it requires time. If you decide to express them, it can alienate you from others who would have otherwise liked you. Opinions aren’t cost free.
Have as many opinions as you want, but make sure they’re worth it. Life is finite and every bit of time, energy, and attention that you spend defending this or debating that is time, energy, and attention you won’t be able to spend elsewhere. So make your opinions count.
When your time on this earth runs out, you don’t want to be one of the ones who say “I wish I hadn’t spent so much time making nuanced arguments in the comments section of a Facebook post I didn’t really care that much about.”