1) You can write insecure code in any language, and
2) Platforms written in other languages have security vulnerabilities.
When your argument in defense of a computer language can be applied to every single computer language ever invented without any changes, it's a sign that it's not really an argument.
Here's my argument about how I'm as good at ping-pong as everyone else:
1) Other people can play ping-pong badly.
2) Other people have lost ping-pong matches.
It's unfair to say that a vague defense to a vague accusation is invalid. If I said you were the worst ping-pong player in the world because you lose some games I think the arguments you listed would be a valid defense.
We as developers can get too focussed on optimizing and making our own lives easier and the net output to the end-user is relatively the same.
This does not mean to ignore what's out there that's new, but if you see a platform re-inventing features and libraries that have existed already for years in other platforms, you might be in for a few years of patching together things.