There's basically nothing that 'all politicians' have in common. Some things the large majority has in common, like having above-average cognitive intelligence (not necessarily above-average wisdom or common sense though!) as well as above-average-sized egos, but still one can think of obvious exceptions.

And as for Trump, pretty much nobody thinks that Trump is much like 'all politicians' - his supporters somehow delude themselves into thinking he's better, his opponents see that while his ego and greed may be even more titanic than that of most politicians, he's not much like them in the sense that he has very little actual interest in how to run a country, nor does he feel any pressure to pretend he does.

They are not remotely all the same - and with rhetoric like that, you're just begging to just keep getting worse and worse politics. Just because the system will never be anything remotely resembling perfect doesn't mean you should cheerfully abandon any and all attempts to make it better.

In this particular case, now that Biden so shamelessly abused his pardon power and while we all knew Trump was going to abuse it massively anyway as soon as he was back in power, he's now motivated to do so even more, this could be a good moment for a bipartisan crackdown on the presidential pardon power - maybe it doesn't have to go completely, but clearly it needs to be limited.