I don't blame you for not trusting and totally understand your point
in the end it's a matter of risk/rewards
you don't have to keep all your coins on the same place (this wouldn't be so smarteven if you hold it on a hardware wallet inside a safe)
Correct , things happen so separating is the best way to store our funds , Maybe using multiple strategy much better ,I use ledger for My main funds ,i also Risk some funds in my Mobile wallet because this is for the readiness in case i have to convert to other coins that has a good movement ,and others are in a Gambling site (Trustworthy) for My gaming purposes, specially like now that the value of Bitcoin really fly High so at least i have funds to use.
that said
it will be hard to find a website that let you bet on the elections in a trustless way,the closer I think we'll come to that is some smart contract on the ethereum chain, but you'd still have some degree of trust on the smart contract itself (which is usually auditable but not 100% free of the possibility of issues - like everything in life)
This proves one thing ,That in everything we Do ,risk is always there and even How hard we try to prevent at some point this may cross our way.