I don't get it. He had already found 3 elements (co-found technically) what's the motivation for more?

He possibly felt pressure to publish exciting results. Once you set the bar for yourself at discovering elements, there isn't much wiggle room.

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Those physicists, always looking to make a quick buck.

But it's also peer reviewed and if results are not reproducible then those results are ultimately discarded, especially when better science comes along.

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Two more and he'd get a 6th for free.

Because you are asking if we should trust science. We can. Just have to go through the process correctly as this person said

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There's some evidence that at least some of his work on those elements was also initially falsified - it seems like he was faking data to get the results he expected so he could claim the discovery ahead of any other team, and then conducting the experiments properly later.

It's just that the first few times, his hypothesis about the qualities of the new elements proved correct enough that his 'results' could be duplicated and so nobody looked closely at his work, while with the later elements, he was way off and nobody else could get results even close to what he was claiming.

Do people get one downvote and delete their account??

At least he didn’t merge his daughter with a dog.