To me the situation seems pretty simple.
Nobody wants the Grexit, because we can't quite know what the consequences would be.
But the EU also doesn't want to just pour money into Greece without them having reforms in place to bring them back on track, so EU proposed some reforms and now EU and Greece are fighting over them, because Greece thinks they are to harsh and won't help but the EU thinks they will help.
My position is clear up until when it comes to the reforms.
Of course Grexit would be bad, could have a domino effect, nobody can know how much that'll cost the EU and it could be devastating for Greece.
On the other hand Greece lived beyond its means for quite some time and they now have to lower their standards quite a bit.
It also obvious that the EU isn't willing to just pour money into Greece and let them continue.
I'm unsure about the austerity measures. Germany is actually a pretty good example for these things not working. After WW1 germany suffered extreme austerity and the population went straight to the political extreme and Hitler was the result.
On the other hand Greece obviously has to cut back on some things, they just have to be careful about what they cut. Its crucial not to hurt companies for example. They have to somehow build a robust economy and I'm pretty sure some agriculture and tourism won't be enough.
From what I've gathered it looks like Tsipras is very much about leaving the people with more money to consume and kickstart the economy that way, while the EU is more about supply side economics.
I'm not sure who is right, but I'm leaning more towards the EU.