- the individual human behaviour of the individuals (and, more important, the leadership) in the respective parties
- the policies that party would pursue were it in power
The SNP and Lib Dems have also suspended candidates for anti-semitism
To use a EU comparison, the Tories are not a semi respectable people's party like the CDU. They are something altogether nastier, like Fidesz
Were the UK election system less messed up we'd not have to face this. But it is and we do.
There are no good outcomes here. But some outcomes are still worse than others.