Remember that we're about
practical, answerable questions based on actual problems that you face.
And the system is engineered to getting you useful answers to those questions, and making them easily available to the internet.
If an answer is valuable, give it an upvote. You can do that for as many answers as you like. Then pick the one that was most valuable to you, the one you actually used and mark that as accepted. This will help future visitors see what worked for you, but they'll still be able to see the other up-voted answers.
A little bit of this is legacy, the engine was designed to do Q&A on technical subjects where the users presumably implemented only one of the answers.