For IAM64, don't be silly? The comparison was with RALLIES in general, NOT the particular people at the front.
NOBODY is saying that Starmer is like Hitler, in fact on all known evidence, he's highly unlikely to try and suggest much decisive policy (at the 2019 election, he was touting I think it was "6 possible Brexit policies"?!).
Various pundits have said that with a massive polls lead, and the wretched Tories determined to keep shooting themselves in both feet, he needs to say as little as possible other than general 'feel good' slogans.
[NB -- having voted since the 60s, and with mountains of evidence, I lost faith many years ago that ANY of our politicos, any badge, would shed the easy accusation that they are generally incompetent, often corrupt, and far too likely to put party interests above ours. I suggested back in the 90s I think it was that we should sub-contract out our Gove to somewhere sensible like Holland or Denmark, they could do a better job in about 2 days a week, and cost us far less!]