A Tory vote is a vote that endorses Racism, Homophobia, Sexism, disdain for the disabled, the homeless, the poor, the working class and everyone impacted by austerity. To say it isn't is to lie to yourself.
Labour are not the only alternative. Lib Dems, Greens, SNP, Plaid Cymru, Independents, vote for any of them.
The two main parties will only get better when they realise the electorate demand better from them. We can only do this with our vote and by voting for someone else more deserving of representing our country at the highest level. Otherwise it will continue and the same shite will be offered up time and time again.
The Tories have done nothing during their tenure to deserve another 5 years, their infighting on Europe and internal power struggles led to the shit show that is Brexit, the ramifications of which will go on for generations. Nobody is shouting about all the great things they've done, just the PM, a serial liar (not someone who lies a bit) avoiding proper scrutiny whilst lying to everyone gullible enough to fall for it.
It's scorpion and the frog.