Can you actually point out to instances of having to work more in practice due to people taking parental leave?

Other countries tend to have much stronger labor protections so the end result, surprisingly, is often that you're not really doing more work especially if the company is prepared. I just went through an example myself where my relatively small team had a senior developer take parental leave for a few months and the expectation wasn't for us to pick up the slack.

Not leave -- and note that I'm not opposed to the leave policies -- but I worked at a place that involved travel. The parents always managed to get out of it. I ended up leaving because what would have been a reasonable amount of travel split 4 ways was an unreasonable amount split 1 way (me) with 3 parents who did virtually none of it.

Well your original post made no mention of this.

I know plenty of people with kids that have to travel for work. And they make it work.

FYI, retaliation over parental leave is a thing too. I have a friend who took 2 months parental leave. When he came back he was put on call for a year straight.

What other post? I think you're talking about someone else.

If the government is covering the leave and you're not hiring a replacement then why are the remaining workers getting "the same pay" for the extra work?

That's a horrific attitude, you cannot seriously think you have a successful business if this is what it takes to destabilize it. Try harder.