What’s the point?

What’s the point of getting your tubes tide if there is still a possibility you can get pregnant? I have 2 kids and I don’t want anymore. I want a permanent solution so I was thinking getting my tubes tide would be the way to go but I’ve read so many blogs online where women would share how they still got pregnant or knew someone who got pregnant after getting tubes tide.

So if there is still a possibility of getting pregnant whats the point of the procedure? Is there a permanent solution for a women to not have kids?