Firstly, getting a job does not guarantee that you will not be better off without welfare. For example, the minimum wage in America is less than $10 USD per hour, which cannot sustain oneself let alone a partner or family. Even in welfare nations like Australia, the lower working echelon find it difficult to live with their salary. Welfare is supposed to protect people from poverty.
Secondly, the conservative model of lower taxes do not work for the common man, be it a working class individual or the middle class family. The London School of Economics, which is actually the university that Hayek (founding father of anti-Keynesian economics) attended released a comprehensive study on how trickle-down economics does not work.
As for your points about welfare, it is impossible to strike that balance. The only thing one can do is make a level of comfortable welfare but force welfare recipients to actively search for jobs that is at the same pay level of the welfare payments.
As for your points regarding GDP growth, let me ask you this:
Why do governments (left or right wing) implement cash bonuses to people during economic catastrophes, especially during this pandemic?
In Australia and the US, both conservative governments increased the amount of welfare an individual got during the coronavirus pandemic. In fact, some welfare recipients, if not the majority received payments well above minimum wage.