across a variety of modern up/down vote based platforms, some make it a personal mission to avoid downvoting (the only real exceptions when someone is being utterly objectionable, ie. ridiculously racist/sexist etc or blatant spamming ^(1)^
in general, it is almost always better to have a respectful discussion than mindlessly downvoting and moving on. if two parties can meet for respectful discussion the outcome is almost always superior to the text-book divisiveness of a downvote war etc ^(2)^.
in a great many cases people usually find they don't disagree as much as previously thought, have their mind opened to a valuable new perspective, or at worst accept to disagree respectfully. definitely a better outcome.
yes it is time consuming, but don't we all generally want quality over quantity?
^(2)^ the original idea of a self-moderating community through up/down votes is a good idea, yet appears to have been hijacked by the modern social-media-type weaponised web, which is being turned against humanity to divide and polarize us against eachother. and is particularly suspectible to bot manipulation.
^(1)^ which can have eg. their own flags