Following your reasoning we should all do efforts to translate all the documentation of all the software available in many languages, a major amount of work, instead of asking developers to learn English. And learning English is a major undertake compared to read comments without spacing.

I'm making a pragmatic argument, not a moral one. Adding spacing is easy and it helps more people enjoy your hard work. That's why you should do it.

I believe that improving accessibility of most knowledge through localization is a good thing.

How much a better thing it is that we Europeans learned English instead? Now most of us are bilingual.