SE sites are generally Q&A sites, not discussion sites, any form of discussion and debate is discouraged. Discussion, debate, and arguing are generally not welcome.
Comments are not meant for discussions/arguing/providing an alternative perspective. The comments are meant for things like suggestions for improvement, asking clarification about the question, and pointing out problems with an answer.
You can find information about comments here:
When should I comment?
You should submit a comment if you want to:
- Request clarification from the author;
- Leave constructive criticism that guides the author in improving the post;
- Add relevant but minor or transient information to a post (e.g. a link to a related question, or an alert to the author that the question has been updated).
When shouldn't I comment?
Comments are not recommended for any of the following:
Suggesting corrections that don't fundamentally change the meaning of
the post; instead, make or suggest an edit;
Answering a question or providing an alternate solution to an existing
answer; instead, post an actual answer (or edit to expand an existing
Compliments which do not add new information ("+1, great answer!");
instead, up-vote it and pay it forward;
Criticisms which do not add anything constructive ("-1, see previous
comments you scallywag!"); instead, down-vote (and provide or up-vote
a better answer if appropriate);
Secondary discussion or debating a controversial point; please use
Discussion of community behavior or site policies; please use meta